If you're looking to keep corals.
You'll also need a reef compatible light.
Look up "Reef LED
" on eBay, we call them Tao panels. They will support anything you'd like, and aren't expensive at all.
As for a powerhead.
You're aiming for 30-50x turnover in a reef tank.
Look at a jebao WP-10. They come with controllers and everything. They have options to provide variable flow for reefs, and aren't very expensive either. I use two of they wp-25 models on my 55, and I love them.
Welcome and good luck!