Hello Coolcat,
I am pretty new to bonsai myself, but if I was to make a recommendation for your questions, I would say to hit up some websites that have a lot of good beginner info.
http://www.bonsai4me.com/Basics.html - good beginner articles
http://wiki.bonsaitalk.com/index.php/Beware_the_mallsai - The bonsaitalk wiki page has good info in general on it, but here is a page that talks about store bought bonsai like yours
Finally, since you have a ficus
http://www.bonsaihunk.us/ - An entire section of the site is devoted to ficus and their care... also under "bonsai Cultural Information" a lot of info about indoor bonsai in general and lights for indoor bonsai
Hopefully reading through some of that information will help get you rolling and then if you have any more specific questions I am sure the many more experienced members of the site can assist you.