BOOM. Asking the
real questions...
For solder, can't go wrong with a spool of Kester 60/40. Thinner is better, much easier to control heat and melt times. 1lb will keep you set for
quite a while.
As for a beginner kits, set aside a couple of bucks and just order a few from Amazon (doesn't really matter what). This will help in a couple of ways. First they'll be simple circuits and you'll get a to see a light blink or a get a buzzer to buzz, which will provide some gratification for completing
something. Second, they're not the highest quality - PCBs will melt, pads will be on one side and lift easily, and things won't heat evenly. Basically, if you can make one of these mongrels blink or buzz, you're in good shape for getting something of actual value to work.
Cables are always good practice too. Get 20-30 ft of nice instrument cable (e.g. Mogami, Canare) and some quality ends (e.g. Switchcraft, Neutrik, Amphenol) and treat yourself. For $15 you can make a cable that someone would gladly charge you $50+.
Also invest in aloe. You WILL burn yourself.