If it was easy, lots of people would be doing this. The truth is it's not. In small tanks as described, you will have constant water quality concerns and issues to deal with. It isn't just a matter of running out in the yard and grabbing some fish to eat.
You need water change, circulation, aeration, and filtering as well as feeding system. Bluegills do well on artificial feeds, but benefit most from multiple small feedings per day rather than one or two big feedings. All that food is digested and the wastes are dumped in the water...these must be removed in small systems as you described.
If you can overcome the water quality issues and resulting material expenses and labor costs, then you need to be prepared to feed and manage for a couple of years to get decent sized fish produced.
Do your homework... a good source for reading are the articles published by the SRAC at this link https://srac.tamu.edu/index.cfm/event/home/
Please don't misunderstand....not trying to discourage you, but if you understand the amount of time and money required to do this on a small scale...and you still want to do it, you will be better prepared. Good luck.