I would suggest getting it contract casted, if you think it is good enough that people will pay money for it.
You can post a pic of your miniature here, for opinions as to the green's marketability. If the sculpt is good, people will want to order it, and some companies will probably step forward to offer casting assistance to you.
You can sell them through the contract casting company for a percentage, and/or independently on eBay, or your own website.
That should help you to start earning some revenue, to help pay for your venture.
Contact several companies, and see who will give you the best deal.
I doubt too many companies will be keen on giving more than just general advice to a possible competitor. You can always ask though, since I may be wrong on that.
Manufacturers of the equipment will be more likely to provide good advice to you, since they have an incentive to get you to purchase their equipment.
Check out the Casting Yahoo Group, for more help and assistance. There are others there as well, for mold making, etc. Still waiting to get added to that one.
You can also peruse the scuplting, molding, and manufacturing message archives here on TMP for additional info.
Good luck on your venture.