Welcome! I have no idea if you'll find this post or not, but I'll try and answer.
First, you can find your post in your activity stream (click the My Place) tab at the upper right. You can also find it under Recent Topics at the moment. It's Thanksgiving in the States, so the board will probably be slow today, so your first post is still "recent".
As for your question, my best advice is to not be afraid of the mess. Scrapbooking gets messy and that is part of the fun. If you are afraid of ruining nice paper, then practice on scraps. Just play, experiment and have fun.