G,
LOTS of folks fly fish and never learn to tie. I agree with your assessment, learn to cast, then learn about bugs and terminal tackle - start with dry flies, otherwise, you might just as well fish with a spinning rod. [Oh, I bobicate, but if it weren't for dry flies, I doubt that I would fly fish]
Soon enough you will get bitten by the bug to tie, and then you will eventually catch a fish on a fly that you have tied, hopefully a dry. The day that happens you are doomed to a life of happy frustration.
Find your local Fly Fishing Club - can't be said too often - they will help you get better.
