I'm new to guineas this year, too. I started out with 4 adults (3 females and a male) and bought the book, Gardening with Guineas, to get the basic information. (I don't think it's a comprehensive guide to raising guineas, but it gave me a good place to start. (There's another thread here on people's thoughts on the book.))
After 2 weeks, with a fenced area around their coop, my guineas understood where home was. (During those 2 weeks, we had to lure them into the coop with a bright light at first, then a little solar nightlight. They're attracted to light at night and will not enter a dark coop/building probably because their night vision is horrible.)
Things I've learned:
Do not let them roost outside at night. Even if you don't think you have owls around - you probably do. You'll lose your guineas. It's pretty easy to herd them back to the coop if they decide they want to stay out - with a couple long sticks held low, you can nudge them towards the light. Just try to keep an eye out for them around dusk to make sure you get them before they fly up to a branch- otherwise, it's not easy to get a night blind bird off a high branch!
They love, love, love dried mealworms. It's the easiest way to get them to go anywhere.
They're not necessarily bad mothers. Two of my females shared a nest box in the coop. The keets are 2 1/2 weeks old now. The mamas don't know to keep them off the dew or out of the rain, so we just keep them all in the coop if it's wet out. Besides that - they're great - very attentive and protective. Today, they taught the keets to roost.

So, I think the "bad mothers" reputation isn't always true.
They love dust baths. Make sure you have a dry or sandy spot for them, or they will dig a hole for a bath. (Mine like a spot under an evergreen. I add some play sand to the hole every once in a while, so they don't dig deeper or start a new bath spot.)
A cheap solar light or two for the coop are great. They're enough light for them to be comfortable going in at night and will gradually dim as they go out. No abrupt switch off and a night blind guinea bumping around in the dark trying to find a roost. If you have a barn/shed for them with a light - just leave it on until you're sure they're all settled in.
I think those are the biggest things I've learned. Like the other posters said - they get along with chickens. Plus, they're bug eating machines. They don't scratch up your flowerbeds/garden like a chicken would. Oh! And if you have a garden, never feed them tomatoes. Apparently, they will love them, and if you teach them about tomatoes, you can kiss the ones in your garden goodbye.
Good luck with your guineas!!!