hello there

You have to make sure your males are bigger than your females to he can wrap himself around her. Also You have to get them ready for atleast 1-2 weeks by feeding them up with bloodworm. Also you do not put them in the same tank straight away, they will defiantely hurt or KILL each other.
Best to do alot of reseacrch. Google is your best answer

thats how I learnt everything I know. Also you should probably have about 4 females. They will get along better together and its ment to be 2 females to every male

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and to tell you the truth BEST OF LUCK. Its easy enough to breed them.. and quite facinating.. but keeping the fry alive is the hard part.
Google on Breeding Bettas
http://www.google.com/search?client=opera&rls=en&q=breeding+bettas&sourceid=opera&ie=utf-8&oe=utf-8
Betta Fry (baby) Food
http://www.teradoty.com/bettas/fryfood.htm
Tank set-up for breeding
http://www.google.com/search?hl=en&client=opera&rls=en&hs=yWu&q=breeding+bettas+tank+setup&btnG=Search
LIke I said. Alot of reseacrh, ITs easy

Let me know how it goes.
GOOD LUCKKK =D xx