Welcome
Check out SignCraft magazine (annual subscription worth the price, get free price guide) and
Sign Builder Illustrator (free to industry folks, also now have on-line pdf version).
On this site go through the threads in the various forums, lots of info, and post specific questions (and please give enough information we don't have to try to read your mind).
Check out
www.signshop.com run by the
Sign Builder Illustrator publisher, there are a lot of helpful articles online.