hi kj,
i also dunnoe. so what u need to do is:
1) read the photograhy related threads to give you an idea on who's good, who's not good.
2) get quotations from photographers
3) meet up those that meets your budget. e.g. xxx is sooo good but their basic is $2000 for AD. are you ok with it? if yes, then meet up with them.
4) no point meeting soooo many and then u blur on who to choose. shortlist those only if you feel comfortable with them and like their photography style. no point if you like their style but u have no chemistry with them.
so, afterall its not that tough. the tough part is if you meet alot and then you get a dilemma as to who to choose cos there are too many options.
remember that there are hellalot of photographers out there so u cant be seeing all