Hi Lulu,
Good on you for wanting to do your own business!!!
DF and I are in the process of disolving a biz partnership at the moment which ended really badly.....
I guess it depends on the type of business you are interested in - we had a fencing biz and it the biggest problem we had was that our partner had a higher level of living than we did (leased car, renovating house etc) we tend to do everything cash and he doesn't so he needed to withdraw more from the biz than us which made it awkward as what was being drawn out was more than the biz could sustain (we had to draw an equal amoount) he then started to dodgy quotes so he was taking more from the jobs etc and it's ended in a lot of tears.
I personally would never enter into another partnership outside of Dan and I again as long as my ar$e points to the ground....LMAO
but that being said I have friends who are in perfectly harmonious business relationships as they have the same attitude to money, the direction of the business etc and therefore have no dramas ...
I hope this helps somewhat

Good luck with it all