Looking at the instructions, and that box of lumber, can be daunting. Once you get into it, though, you'll soon figure out what's going on.
The plans and instructions should be straight forward. They'll lead you step by step, through your build. If you do run into questions, members of this forum will surely come to your assistance.
If you do a build thread, we can watch your progress, and alert you if we see anything questionable.
Welcome to building. Many of us find this side of the hobby the most enjoyable, with flying being an added bonus.