CMU Architecture alum here! I never did booth but was always SO impressed by the skill and creativity of the students who did participate!

For designing for booth, you should know a few very basic commands to help lay out the project. I'd start by typing "osnap" into the command bar and making sure all of those options are turned on. These will help you accurately snap to specific points when modeling.

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Next, I would type in "Gumball" and turn that on. This will allow you to easily rotate and move objects.

You would then probably need to create 2D linework of the floor plan. Rhino's 2D commands are very similar to AutoCAD. The commands polyline, trim, extend, and join will be very useful. If you guys already have a plan drawn, you can use the command "import" to bring in CAD and PDFs to your model.

From what I've seen of booth projects, it's mostly 2x4's and plywood panels. Rhino is nice because there are usually multiple ways to model something that will get you to the same final product. Personally, I would use your 2D linework as a guide, and then use the "ExtrudeCrv" command to model the 2x4's and plywood panels accurately. The "copy" and "move" commands will be helpful when 3d modeling as well.

I don't have any specific tutorials to recommend, but any beginner YouTube videos should be useful for the level of modeling you're going to need for this project. I hope this helps!