firstly welcome to the wacky world of cloth nappies.
in terms of sizing there are two types on the market
sized (ie small, med, large) weights to sizes will differ by manufacturer
btp (birth to potty) which adjusts as lo grows
you then have two main styles
two parters - like traditional cloth and require a wrap
aio/all in ones or pockets - these have the waterproof layer built in.
there are slight variations on those types but they're the basics also
the one thing you need to consider is budget, the initial outlay to buying cloth often puts people off. also please bare in mind each lo is different and the same with sposies not all cloth will have the perfect fit.
we started out buying used nappies to try lots or types, then slowly sold the ones that i stopped reaching for and brought more of the ones i preferred.
the bumgenuis flip is still on BOGOF at fillyourpants.com, and babipur.com (january only) these might be a good starting point for building your stash.
what alot of people who are starting out tend to do is part-time cloth until they've build up enough nappies to go full time this way you can spread the cost.
