Maxi jets are powerheads, and they come with an air inlet in the top. Simply modify the tube to take in your CO2 tube, and you're set. It's quite simple.
I would then suggest you buy a canister filter as filtration
Good luck with your setup
EDIT: Sorry, didn't see your previous message! you can just go for a powerhead and powerfilter combo, but the power filter is going to break the water surface, thus losing some CO2. If you're looking into plants, I'd seriously consider cannister filters, since the cost for lighting and substrate is quite a lot, so might as well go with a canister!