You said you needed help to add an adventure with world-building a secondary concern (something to add later). If I read your post accurately, then my best advice is to go use a bottom-up approach rather than a top-down approach. When I started using RW, for the first couple months, I just used it to build my world, but even with countless hours of work, most of my topics were big-picture topics, covering the world, different realms, races, languages, history, etc. When it came to preparing an adventure and use at table, I realized that all my time was just flavor text. Still very useful and important for informing and giving ideas for adventures, but not very useful at the table.
I recommend that you focus on the story line. Map out the story on the story board. Don't worry about what topic you'll associate with each scene/encounter, just map out the overall storyline and its twists and turns.
If you are like me, you'll likely fiddle with it for awhile, splitting some plot points, combining others, adding and deleting. It is easy to do in the storyboard, but is more work to be breaking up and combining topics.
After you are happy with the story board, decide which require more info that the text in the plot point itself. Keep in mind that plot point text will not have autolinks, but if you have a simple decision or "travel montage" that you don't intend to spend much time on or can roleplay without any special preparation or need to reference in the future, you really don't need to create a topic.
For those that you want to have detailed out, referencable in the future, and autolinked to other content, you can right-click on the plot point and select "associate contents with the plot point". from the "select content to associate with plot point" dialog box, you can create a new topic by clicking on the blue plus icon next to the appropriate group. That will open a "create new [topic] element". Use this to enter the bare minimum for the new topic. If you don't have much world content developed, you can just enter the name and be done with it. Otherwise you can select the container topic you want it to be a child of. If you don't immediately know how you want to organize it, DON'T WASTE TIME THINKING, just enter a title and and click CREATE. It is easy to organize latter.
For me, most topics associate with plot points are scene (a type of event) and adventure area (a type of place). I will often also use location and community (also place topics). Occasionally I may have a plot point associated with a merchant topic if the interaction with the merchant is important and I plan to have the merchant reappear in future adventures.
I've seen others on this forum who create a plot point for every room in a dungeon, mapping out the path that the players can take through the dungeon. Each room associated with a scene. It looks cool, but for me that is too much work. Instead, I would have the dungeon as a location topic and in that topic I would have the map as a smart map and use pins for the room, some of them further associated with scenes and for some I would just have the room description and GM instructions in the pin description itself.
At the end of this first phase, you'll have your story mapped out, and the skeletons of the scenes and important adventure-level places linked to their appropriate plot points.
At this point, I right click on the plot point and view the associated topic in a new tab. I usually don't do this in story order. I do it in inspiration order. Which scenes or places am I most interested in working on first, what cool idea do I have that I want to capture now? I find that even if I don't complete all associated topics, I can still run an adventure if I have the content most important to the adventure completed.
As you create your topics, you'll think of context. For example, you'll be creating an adventure area to describe a section of travel on the way to the dungeon, with random tables, etc., and you'll start thinking about the races, cultures players will encounter, the realm that the area is in, an important historical event that took place there.
My advice is to write it into the description of the topic. DON'T leave the topic and break the flow of creative thought. If you the adventure area is the "swamp land of the lounging lizards", you can type in "On the way to the Dungeon of the Sadistic DM, the party must travel through the swamp land of the lounging lizards. The swamp land is a lawless area on the edge of the Barony of Deorfolkingham, part of the small Kingdom of Laceratia."
I would then highlight "Barony of Deorfolkingham", and while that text is highlighted use CTRL+Q to bring up the quick-entry form for "create a new content element". The highlighted text will already be entered as the topic name. You just need to select what kind of topic or article it is, in this example it would be "Place:Region

olitical". Same with "Kingdom of Laceratia." Again, just highlight, ctrl+q, select the group and save. You can fill in details later but now focus on the content you need for your upcoming adventure. You'll note that I could create the quick topic for Kingdom of Laceratia first and then create the one for the Barony, so I can make it a contained topic for the Kingdom, but I prefer to make it as quick and unobtrusive as possible so that I stay focused on writing the adventure text. I can always categorize and do filing later.
Anyway, that's my "bottom up" approach.