yeah. I am new to this field.The question leads me to believe, you are not an experienced designer of any sort. Apologies if I am incorrect. If not, software alone will not make for a successful business. Most pros would likely use Illustrator to produce the graphics to go on apparel and merchandise. If you have no experience, I’d suggest collaborating with a designer. It is a very saturated market and there are a lot of people out there with no knowledge and experience who see it as an easy way to make a buck Elliana Rose.
Most of them out there are pretty dire. The ones that stand out are the ones that are done by people who know what they are doing. If you do, then as I say apologies. If not, I’d suggest rethinking how you approach it all. Illustrator is the way to go, but it is really only a fraction of what you’ll need to succeed.
Good luck. Hope this helps.