The kit should have come with a 170 page book to help get you started. Adafruit also has a bunch of great tutorials made for beginners here:http://learn.adafruit.com/
As for soldering, that's a completely different skill set. You're better off using a breadboard and avoiding soldering until you're a bit more comfortable with electronics. When you're ready to make a design permanent, the Pace corporation made a bunch of instructional soldering videos back in the early 80's designed for classroom use that are available on youtube now. Here's a link to lesson 1:https://www.youtube.com/watch?v=vIT4ra6Mo0s
The videos may be old, but the information is still good.