Hello and welcome to RPG!
Don't worry, we all start as new players so don't worry about making few mistakes here and there, you'll learn soon enough. If you haven't looked at the New User's Guide , that might be a good idea to do. You can find the link in the sig. Besides making sure that you post your posts in the IC and keep other chats and discussions in the OOC section and making sure to read your post before posting, I can't think of anything on the spot but if you have any questions at all, feel free to PM me and I'll be more than happy to help you out.
Happy RPing~