To make it really easy to create on-chain bounties, we've created a round creation wixard at https://round.new/.
At any point during this wizard, you can save an (off-chain) DRAFT while you finalize details, and then Mint it on-chain once its ready.
Set deadlines, reward amounts, and application details for your round. Here, you can also specify whether you want your round to accept additional funds.
Once you've specified round details, you can go ahead and press "Mint round" to create the round.
After this stage, you will be taken to the individual round page with URL
round.space/round/[ROUND-ID]. You can share this page with your community to start accepting submissions.