Not to harp as you got some great advice.. multiple large tanks, MANY jars, and a way to heat them all.. a 30 gallon is simply not enough.
Also, you mentioned a few friends/family, but what about the easily 100+ more you may have after giving out a few? If they are VTs, they won't sell all that well unfortunately, and most places won't buy them from someone who isn't properly set up and a verified breeder.. are you going to ship? Do you know how to properly ship and when to do so? The hundreds you may spend on shipping alone- boxes, bags, heating packs, cooling packs, foam, shipping, etc. Breeding is hundreds of dollars and can get into the thousands in time.
I definitely suggest spending the next few months you are going to need to condition those fish and save up the money and do more research- from the pictures you have posted, and your avatar, they aren't near breeding condition.
It really isn't fair to bring hundreds of babies into this world only to have to be culled (where you have to go and individually pick out babies and kill them) because of improper conditioning, breeding, set up.
I suggest dividing the 30 gallon that has a heater and putting what bettas you have in there and enjoying them for now :)
Edit: Breeding forum
Here is the basics you will have to do for breeding. I also suggest getting a 10 or 20 long for the breeding tank, as the male and female have to go down to the bottom to collect the eggs, and a smaller tank would make it easier since a 30 you would have to put the water too low for a proper filter.
Betta babies aren't like guppy babies, or other live bearers.. bettas don't mate as frequently as they do, and they require much more careful care.
Wish you luck..