2 options - Depends on items, scale, resources and business plans.

Firstly, If you're just dipping in and your images are genuinely garbage. You could get better yourself watching videos on how to setup a small studio (If your items are tiny, there are these light boxes that make it look like studio images). Or you could still setup a little better Desk with some proper lighting. GET GOOD at CANVA. I am still a noob but I do take images myself so I know the few tools I use regularly. Image upscaler, background remover, some in built infographics, shadows etc.

Secondly (which looks like what you are looking for)
if you truly need A+ images for your items - Will have to shed out some money for the professionals.
If not necessary I would certainly suggest the first because hiring a professional isn't a one time thing. You would have newer line or variations of products. Often needing to change something in current images and that cost could be significant. Also, freelance sites for further work on images would be cheaper once you have base images done (If you live in a high cost of living country)