Convert Design To Print-Ready

I have already finished the artwork and it currently lives as a JPEG/PNG file. Now I need it converted into a professional, print-ready format suitable for screen printing or DTG. Feel free to adjust the size to whatever a printer will require; I’m not locked into specific dimensions… (Budget: $30 – $250 AUD, Jobs: Adobe Illustrator, Adobe Photoshop, Graphic Design, Illustrator, Photoshop, Photoshop Design, Print Design, Vector Design)