Steven_Askham, I know you are a younger member and very excited to get going in the aquarium hobby. My advice to you is to do some of your own research. Everyone here is well intentioned, but what works in Ohio or Oregon, may not work for you.
Research the needs of Mbuna in general and then focus on yellow labs or rusties or whatever strikes your fancy specifically. Once you find the information yourself, you will retain it longer and it will allow you to make more informed decisions. AA is a great place for advice, and we have enough experience to help guide you; however, you need to be able to think about our advice and decide if it is best for you.
I disagree with greenmagi's advice on 50-75% water changes.
IME, changing over 30% per week does not lead to spawning fish. It leads to stressed fish that may decided their environment is unfit for raising young. I do agree that a 30ish gallon tank should only hold one species in a limited number. You are correct in saying more Mbuna=less trouble and territory disputes, but in a tank that small, there's hardly any territory to dispute as it is and fish dealths will be high. I used to have my Mbuna in a 29 gallon and it was a disaster. Now they are in an 80 gallon and all is well.
Mbuna evolved as primarily vegetarians and this needs to be kept in mind when thinking about what foods to feed when getting ready to bred them. Too much protien can lead to Malawi bloat, which is often fatal.
How long have you been keeping fish? Are the angels breeding, or a male/female pair? I know it's a bummer to have a tank with ween little fish in there, but they will grow. Start small and work your way up. Along the same line, enjoy your fish first. Watch their behaviors, so you know when something is wrong, or if a fish is holding. Don't put the added pressure of breeding them on yourself. Do you have a plan for when they breed? Will you house the mother separately? What if the mother spits out her young too early (happened to one of my fish and the other fish gobbled up all the fry
)? Do you have a grow out tank, or were you going to test the prinicples of "the strong will survive"? You need to think about all of this and research it and then ask questions.