Wouldn't recommend seahorses, especially being a beginner. Not saying it can't be done, but even experienced hobbyists have a hard time keeping them alive. Having the clowns in there with the seahorse will give the seahorse a slim chance to get food b/c they are such slow eaters and eat constantly throughout the day and not just once a day or every few days. That's why they are recommended to be kept in a species only tank or with pipefish. They don't do well with competition basically and they require stable conditions (temp, pH, nitrate, etc. can't fluctuate a lot). Would recommend keeping fish and possible some corals if you want and maybe in the future getting seahorses if you are willing to do the maintenance, spend extra time feeding, etc.
“Success is walking from failure to failure with no loss of enthusiasm.”
- Winston Churchill