Well a heat press is a good investment. I would suggest nothing smaller than a 15x15. I suggest buying aname brand (Hotronix,hix,mighty press,geo knight) These brands have solid customer support. I suggest buying a used name brand press if your budget doesn't allow for a new one. I have bought 2 used press' on ebay and have used them both heavly with great success. I would then pick a design and have it made intoo a plastisol transfer. This way you can press them as you need them and don't have to keep a large inventory of completed shirts around. I suggest you start by getting your designs and marketing together. If a press is a issue to get started you could most likely find someone to press them for you for a nominal fee. Good luck. ..... JB