ORIGINAL: Charlie P.
The "old fashioned" way was to start with the cheapest of Gillows or Proctor kits (rubber-band powered or free flight) and teach yourself following their instructions. Takes about 12 models of increasing difficulty and you'll be ready for anything.
I don't know anyone who gives building instructions professionally. But I know dozens and dozens of guys who will help you with tips, suggestions, kibbitzing and advice. Our club is full of them and so was my former club A local Explorer post arranged for four of our club members to build Sig LT-40s (in teams of four students per instructor) and it was one of the most enjoyable things I've ever done with R/C. If you can find a club and mentor to clamp ont who could show you some of the basics it would be (IMHO) the best way to get introduced to building.
This is very good advice
This is how most of us got started