The big pork producers are sending 500+ pigs away every day for the big grocery chains, due to the numbers involved they can absorb lower prices per head and keep their overheads down. Some of these farms have upwards of 40k pigs at various stages of production. Some producers do farm out their finishers to other farms, they also provide all the feed, however, unless you live in the same area the transport costs would make it non-viable. You would also need to comply with their very specific housing, feeding and health requirements as its their reputation and business that is at stake. Without a degree of experience of pig keeping they may not look favourably on you as they are taking all the risk.
I'm not trying to dampen your enthusiasm, but if you were to try it yourself you would need guaranteed outlet contracts for the pigs and they will need to meet specific standards from the retailers or you may not get paid. It's also a numbers game as the larger producer is better positioned to absorb fluctuations in the market; say 50 pigs left unsold would soon literally 'eat' all of your savings very quickly.
You could always do what we do on here, keep a few pigs for meat or breeding and enjoy the experience from your own home produced quality product.
Good luck.