Its pretty easy get a male and a female plant and they will do the rest, like most things they dont dont even have to be in love. Where it gets tricky is when you want to breed and grow for smoke in the same space, that makes is a bit nerve wrecking, so I have a 2 X 2 X 4 tent I use for breeding but that is just me. 

Regular seeds

https://www.growweedeasy.com/advanced-breeding-techniques

If you want fem seeds

https://www.growweedeasy.com/how-to-make-feminized-marijuana-seeds