get your self a camera, if you will work with your own dick ( perfect, you dont have to pay anyone else) pay the girls around 600-3000$ depending on who you want.
Now, the best and important part is sell the dvd...
BUt better yet, if you know how to make website etc. You will definitely make money. Since all you have to do is put up links and burn dvd's and sell them. But, if you know more about website you can add memberships for 2.99$... you will go crazy of how many people will come and pay those 3 Dollars. All you have to do is get as many hits as possible.
( if you dont know how to start a website or all of it) your profits will be minimum.
Remember those big porn industries make at least 5 scenes per day. Which if you think about it have an spending of at least 10k just on girls on daily baisis, that say you gotta pay a few dozen of people. But, of course they started low, probably when there was little competition. Now, you get porn for free online... so? redtube.com has excellent videos, for free. I mean thousands of vids. as many as 12 new ones per day.