If I posted all the pics of my angels, there would be 100 of them, let me look through my pics for some breeding in action pics or something like that. Experience with them pairing & spawning, and having to switch fish would be a small book, I call it my fishroom log.
If you have a filter intake, they will spawn on that. Even if you have plenty of suitable pieces of slate, pvc pipe, or plants, they somehow seem to know that the intake can't be removed. It's happened to me countless times, as well as other angel breeders I know.
There are a few things you can do to get this started off right. Get quality fish, preferably from a breeder, or from a non-corporate owned lfs that deals with local breeders. You get what you pay for.
Quality food is a must, I use Omega 1 flakes, and Haikari frozen brine shrimp, and occasionally bloodworms. Too much bloodworms tends to lead to constipation & bloat, they only get them around once a month. A variety is best, as is frequent smaller feedings as opposed to one large one daily.
Water changes & more water changes, angels love fresh water. Treat them like discus in regards to water quality, and they do incredibly well, growing thick & healthy.
Depending on the age of the fish when you get them, it will take from 3 to 6 months before you see any pairing behavior. Worry about growing healthy angels first, once they start to pair off, deal with that.