I played my best tennis when I knew the least about equipment/gear.
I used a Wilson Hyper ProStaff 6.1 95 strung with Klipper Synthetic Gut (gold color). That string is a solid synthetic, but an even more economic option is Gosen. I'm a fan of that as well. Still have a reel of Klipper Nylon I use often.
Get in where you fit in.