Hi stacy, You should be good with the 2 batteries that come with the eGo kit. I would recommend having at least 5 attys on hand just in case a few go out. If you were vaping 8mg and feel you could do 6mg I would go with that.
As far as juice type, its all a matter of choice. I vape PG, but I do like VG also.
Wordup is a great supplier so is vaporgalaxy.com or electronicstix.xom. Good luck and tell us how it goes.