The hi lite is a simple solution to getting pure white backgrounds. It works, but has the limitation that that is
all it can do. if you were to get a plain grey background then, assuming that you have enough space, you can leave it unlit to produce black, put the same amount of light on it as you put on your subject to get grey, using lighting gels to make it any colour you like, you can light it through cookies to get any kind of pattern you want, etc.
If you want to go the hi lite route, any type of flash will do. A lot of people use cheap hotshoe flashes.
When it comes to lighting your subject, this is quite a big question. Your starting point is to remember that there is only 1 son, so your studio lighting should use only 1 light or, if more are used, 1 light should be brighter. My advice is to start with 1 light, use it with and without modifers such as umbrellas and softboxes, at various distances, heights, angles, and see what works for each type of subject. Use a reflector instead of extra lights whenever you can.
Take a look at
these basic lighting guides, they may help.
If you're looking for a cheap lighting kit, you might light to consider
this one, I've tested it in my own studio.