It was the teething pee and night nappies that got me, the smell was literally eye watering!
We used reusables from 9 weeks (she was a very skinny legged 9lber at that stage!) as I didn't have anything that fitted before then.
Start out by looking for a local happy library where you can meet other users, get demos and hire kits cheaply before you buy. The nappy last survey is also good for getting an idea of what might be useful.
Personally, we found different types worked at different times. We had a mix of gnappies, bumbles, little lambs pockets, bumgenius pockets, bumgenius all in ones, motherease onesize and prefolds.
I found sized little lamb pockets the best for daytime as they were the best fit with double elastic on the legs for containment and they came up longer than birth to potty ones. At night we used motherease onesize staydry lined nappies under fleece wrap.
Prefolds with a nappy nippa were our reliable fall backs and is consider just using these in future as they were so easy to maintain, versatile and cheaper than most.