No kits will really be easy to build, sadly. The easiest kit to build that I can see is the Tamiya Grasshopper. You may need to build the transmission for him, but the rest is easy as far as building goes. You can also find time lapses of the building to see how bad it can be.
Kit;
http://www.horizonhobby.com/TAM58346...FdgHgQodUUAH_Q
Radio;
http://www.hobbyking.com/hobbyking/s...und_Radio.html
Servo;
http://www.hobbyking.com/hobbyking/s...13sec_58g.html
Charger;
http://www.atomikrc.com/collections/...alance-charger
Battery;
http://www.atomikrc.com/collections/...universal-plug
Good luck with your search, and if you have any more questions, feel free to ask.