Welcome to the Forum guys!

First off, I strongly recommend going and reading several of the threads in the Build Diary section of the Forum. Everything you just asked is in that area and has been covered by pretty much everyone; you will learn a lot more reading it for yourself than us just giving you the answers.

If you read up on all the info and still have questions then that's not a problem.

I will give you a starting point for some of the items, but I won't tell you what they do so you will have to work that out for yourselves, but its pretty easy. Some are things you will need, others are commonly used items, and some are other items you will need to charge/maintain the robot...

DX6i - TZ85A - Orange R615X - 10mm HDPE - Barrel Nuts - Turnigy Nano-Tech - Accucel 6 - 31A power Cable

... good luck!