O.K......lots to cover then!
Personally I'd start with individual portraits rather than family groups etc, unless that's the only experience being offered. I did my first proper portrait shoot a few weeks ago with 2 models, and it was a bit of a nightmare trying to direct 2 people simultaneously, I wouldn't want to do an entire family till I've got a lot more experience!
If you're starting off getting to grips with natural lighting (a good starting point, trying to throw yourself in with lots of flashguns etc might be kit overload), you'll probably want to invest in some fast prime lenses. These generally have much larger apertures than their zoom counterparts, so you can get much more creative with depth of field.
The usual recommended starting point is the 'nifty fifty' (someone will probably have already recommended it by the time I post this

). The Canon 50mm f/1.8 II to give it it's full title. Reason it's so popular is because it's dirt cheap (£70 new from 'kerso' on here). It'll introduce you to the added difficulties of focussing with faster lenses, something which takes a bit of getting used to. You get very thin depth of field which can be used to your advantage, or can ruin a shot if you don't quite get it right.
Generally speaking, longer focal lengths give a more flattering result, which is why I love my 85mm f/1.8 so much! But you need a lot of room to work, and it's probably not really suitable in a studio except for headshots.
I'd suggest you go to the 'people and portraits' section of this site. Have a look through other people's work, see what you like, what you don't like, and ask them questions on how they achieved their results. Then put their advice into practice
Chris