Another thing I didn't see mentioned about CA is the ability to use Accelerator and debonder(flashback). The accelerator sprays on and instantly cures the CA. Debonder can be a life saver in some cases.
As for buying supplies I go to my local hobby shop but do an incredible amount of mailorder.
Also, If you just starting out you need to read. A lot. Raraties by Mig Jimenez is a awesome for techniques. Also, How to build dioramas by Shepard Paine is great for a bit of history (many of the tech are still useful today). Also, monthly mags such as AFV Modeller or Xtreme Modeller. My basic point is READ as much as you can. .
Good luck.