Well you have alot on your plate and there's a bunch of large and small expenses to run a DWC setup. My electric costs about $7/8 week.
My Setup Costs were = approximately in $$$
$250 lights
$200 for air pumps (5 seperate lines out)
$18ju0 seven flat round (4inch) air stones (I have one inside bottom in each bucket plus one inside bottom of each clean standby bucket awaiting water changes.
The air stones continuously sends fine air bubbles up through the roots. And you've seen that massive, healthy, root ball in that picture right? You will notice a simple check valve in the air line to prevent back flow. I will look into a more manageable video camera than my cellphone. And try to get a grip on posting YouTube vids.
Now just lay the air stone flat on the bottom, and fill the feed water to the (pre marked) water line 2 inches Below* the bottom of the 6 inch grow basket with a 4 inch, rockwool cube and a little clay pellets ($20).
I would only do DWC as the only system.
Maybe you should study up with cocoa choir media form of hydroponics because it's sort of between dirt and hydroponics. Draining is easier if each bucket has drip recovery otherwise the work intensifies to mirror my water changes... I have seen the 5 gallon black buckets with built in drain hoses (for recycling the fluids), Someone near me was giving away over 50 of those on Craigslist free stuff...
I'm getting ready for my pipe and dinner so if you have any questions I'll answer later on.
Oh and I have to cut a slot big enough for the air hose to not restrict airflow.