Welcome to Fiesta Fan! ^^

I'd agree with most of the advisers that have posted above. I've never really taken up Stone Production, but I have Potion and Scroll Production. Both of them help me alot, since I'm lvl 26, and I'd rather carry around alot of Tough Meat, Magic Crystal (LQ) and Spirits Fruit (LQ) rather than fork over cash for potions. Scrolls make a great deal for when you're in a higher lvl area, especially if you're training/grinding.

I should have been slightly more specific. The way I have worked is having two characters. One with Scrolls and Potions, the other with Stones and Potions (messed up a little). Doing it this way, you can use basically every material you get, use them to make stones to sell for cash or potions and scrolls for training. Saves a lot of time and money, plus its good for your future financial aid.