What do you mean by "participate"? Participate in this community? Play the game? But either way: no, CC does not pay real money besides the annual CC championship tournament.
You've paid real money. King now knows you're willing to pay money. You'll get no more ads and freebies after you pay money. Welcome to capitalism and sorry you only found out after you've already paid.
Do you mean the frog? You have to feed it, so you can move it. If you have a colour bomb: use it for the colour of the frog and it will feed on that. You can also use the frog like a normal candy until it's ready to be moved. In this level you should move the frog to get the 3 toffees in the left corner.
Selling accounts is against the TOS. And quite frankly, it's nonsensical. Why would I pay for an account and don't get all the fun out of the lower and usually easier levels? Yeah, no thanks.