Well, I'm no expert on them but...
There are different types of nappies:
Flat nappies - like terry towelling ones which need a waterproof wrap over them
Shaped nappies - (one size and sized) which don't need folding like terries do and also need a waterproof wrap over them
Pocket nappies - which have a waterproof cover and a pocket that you can stuff with absorbent boosters
All in ones - which are a complete nappy ready to put on, but take longer to dry.
It used to be common to have buckets of napisan round the house for nappies but I don't know anyone who does this these days. I dry pail the nappies, so they just go straight in the nappy bucket, I don't add any water to the bucket and as I was every day (or every other at a push) this seems to work fine. Make sure you get a proper bucket with a tight fitting lid, the smell can be bad and it stops them from drying out which makes the poopy stains quite tough to get out.
My understanding is that modern washers are so good that they don't need the presoak in napisan. This means there is no mess at all (and no horrid nappy soup in the bottom of the bucket!)
Also, don't use fabric softener because it will reduce the absorbancy, just like when you wash towels. Some think its ok the use Bold 2-in-1, because the softener in that is clay based which is apparently better but I've never tried it so not sure.
I use a fleece liner inside my nappies and also a paper disposable liner, so the poo never really gets on the nappy. I just flush the paper liner and then if the fleece liner has any on it I give it a sluice in the loo when I'm flushing the liner IYSWIM.
This website here gave a good overall description of all the different types of nappy.
Also, some councils give cashback if you go for washable nappies, I kept my receipts for the ones I'd bought and then I sent them in for my cashback claim, maybe your area might do something similar if you haven't already found out about it?