Lenses are dependent on what the script/director calls for.
In general.
A fast 50 is a great place to start... for price and ease of finding them...Nikon 50mm 1.4's go for about $60 on ebay.
Then build your kit around your eye and taste.
Once you know what lens mount you have it will be easier than you think to try out lenses... go to a local camera shop and spend an afternoon trying some out. I've found lots of people who used to be SLR shooters that have lenses gathering dust and no need/interest in ebay.
For what it's worth... my favorite lens is my Nikkor 35mm f2