I would spend a couple of hours online learning about the basics of Search Engine Optimisation. There is a lot of free information out there to get you started. Even if you later choose to engage someone to do your
SEO, you will understand some important basic concepts of what Search Engines are looking for.
There are of course numerous
SEO strategies, but the underpinning principle is quality, relevant, keyword-rich content. Updated regularly. Start with that and you'll be on the right track.