This part is subjective, most will put in paper towel in a non sealed zip lock to get the initial taproot your looking for a quarter inch to be present then sit it in a shallow hole of what ever substrate your using. Personally I've always just germed right in the dirt still at 100% success just keep the soil moist with a spray bottle for the first 10 days.
I always take the seeds that have sunk in a glass of water and put it into my substrate... the paper towel step has no practical purpose...
Good luck...