Nope, wrong answer. All you need is a a male and female guppy, or a male and female molly (any kind) And most likely, if you buy a female molly, it'll probably be pregnant already.
But a word of warning from experience.
I bought 2 female mollies, my first 2 fish.
1). I didn't know they were females, I let the girl at the store pick out a couple of healthy ones for me.
2). They were both pregnant. had fry all over the tank the next morning.
They were in a 10-gallon tank. This was all I expected originally to have.
I now have 2-10 gallon tanks, 2-20 gallon tanks, 2-55 gallon tanks, plus a 5-gallon tank I bought to use as a sick tank, which soon turned into a regular tank cuz I needed the space for the fish.
I just found out I'm inheriting a tank. I'm going to use that one to begin to totally separate the females and the males into their own tanks to stop this overcrowding. I know it will be a long process, because after separating them, the females will continue to have fry for months.
They can store sperm and have fry every 30 days for several months. It's an never ending battle.
One more warning: Don't think for a minute you'll be able to easily get rid of the fish. I've literally tried every store in the city that sells fish, to give them for free. no one will take them. I've been told that for 2-3 dollars each they're not money makers for them. Can't even give them away to acquaintances. Only one person offered to take some to use as feeder fish, but I declined on that one.
And to answer your question for these two fish, you don't have to do anything special to get them to breed, trust me, they'll do it all themselves. I was told (and tried) lowering the temperature would slow down the breeding--HA-- didn't work for mine LOL
If I were you, I'd look for something HARDER to breed than the EASIEST!