Hiya, If you haven't already got a heat lamp, I'd recommend you buy an 'electric hen' heat pad
like this one instead. They're a more expensive to buy, but use SO much less electricity, you'll win in the long run.
You'll need some sort of brooder ring or cage for them to go in initially. If you only have a few, you could use a big cardboard box. We definitely have never ever used either the bath or shower for this purpose
, nobody saw us, and you can't prove anything.
You can leave them in the incubator for a while after they hatch (until they dry out and fluff up). This is better than disturbing the humidity in the incubator by opening the lid to take them out before the others have hatched.
Apart from that, just some chick crumb, and you're good to go I reckon!