Trips to Tanzania

Traveling to the Serengeti Plains to photograph the big five have been a dream for quite some time. I was looking for any sort of inputs I could get on tour packages covering Serengeti, Ngrongoro crater etc.

Any other advice on the same would be highly appreciable, Since I would be traveling alone, I wouldn't mind staying in a moderate accommodation, nothing fancy but wish to cover quite a bit of Tanzania....

Thanks for reading through :)