@Scouting Ninja
Thanks a ton for all your help :) I really appreciate it! You've cleared up a lot of things so I can prepare for the future now. I think I'll remove the idea of hiring an artist and sound designer and look for a mix of store assets/my own simple work/hiring temporarily for some niche jobs. I won't hire an artist as a hobbyist, but I'll see if I can look for a sound designer. Otherwise I'll pay for them temporarily as well.