I mean really dedicated - like a normal job - five days a week type thing.
I would guess that getting a few good regular customers, and keeping them happy, would produce the best profit/time ratio for a noob couple.
Yeah, when I was camming part time, I made decent money.
I've seen girls do cams like this where their bf was off to the side, occasionally making an appearance. I know they have 'couples' and 'girls' sections, but I can't vouch for their pay rate vs other sites.
If money is the goal, then look at it like a business.
These people may be closed-minded, but it's the world we live in.