How about just doing it for fun and not worrying about selling anything to LFS or getting too caught up in the details. Do what you want and enjoy yourself.
If you're wanting to be sure you can identify the male and female that produced the fry, then you'll have to do a one on one. Trust me, they'll do it no matter how many you put together and one on one will work just fine.
As far as fry surviving in your community tank, you have to be sure to give the fry lots of hiding places. Floating plants for the surface and low grasses, mosses or what have you for the bottom. And then plenty of plant mass in the middle.
Don't worry about feeding them because they'll nibble on algae on the plants and find the tiny pieces of food that other fish miss.
A fun way to maybe try it is to keep your males and females separated (at least separate the breeding females). When you're ready, put the male and female you want to breed together so they can do their thing. Then put each fish back in their tanks. Let the female drop her fry in the community tank and allow the fry to grow up on its own (with lots of hiding places given). Some fry won't make it, but some fry will. If you like the results, then stick with the same mix. If not, try a different mix. Of course, given that you're probably not starting out with pure strains of guppies or endlers, you'll probably get a variety, but you should get some that come out the same.
If you find something you really like, then go for a second generation. And on and on and on.
If you really enjoy it, you'll naturally gravitate to the guppy breeding sites and learn all the details. If not, then you'll just have fun dabbling in it for your own hobby. Heck, just letting different guppies and endlers mate on their own can come up with some fun colors and patterns which you can then pick out and try to replicate.
Some people breed towards a specific goal in mind. They want a certain color, pattern, body and tail shape, and all. For me, I like the surprise of having no idea what will come from the mix. Everyone's different. Just do what you enjoy in whatever manner you enjoy it.
Vicki Rena Filstar pimp #142 (four XP4s/three XP2s/one XP1) Eheim pimp #301 (Pro II 2128) Victor pimp #27 (VTS-253B-320)
90g - Journal
Pelvicachromis taeniatus 'Moliwe'
75g - Journal
Pelvicachromis pulcher 'Lagos Red' Better Pics 8-24
29g - Journal
Pelvicachromis pulcher 'unknown' --
29g - Pelvicachromis taeniatus 'Moliwe'
5g - RCS colony
2.5g - Journal