To start off there are a lot of reasons that stand out to me and need to quickly be corrected.
First i say (dont breed them), only because they are two different tail types and will create really unwanted fry. This is not good because many Breeds with crossings have really bad fins and some of them dont look like halfmoon/crowntail bettas they look like monsters. IMO. Also with them having bad fins they will be not wanted by almost anyone that actually has an interest in bettas or a pet store. So finding home would be a huge problem.
If you do decide to breed them two anyway, then my suggestion is to (recondition) them again because im not sure if you already conditioned them, but i would start all over and recondition them for 1 1/2-2 weeks tops with really good food like another member has said.
Then you SHOULD buy real plants, but many breeders dont breed their bettas with live plants. I would definitely use real plants because it creates infusoria which is a micro organism that feed the fry at an early stage.
You need to have a lot of hiding places like another member suggested.
If it was me, i wouldnt breed them until i get a HM female to breed him to so i know that when i breed them and have about 30-40 fry (if im lucky) i will know where to put them and who to sell/give them away to.