Well, you will need to set up your dish first. You can't really align the dish using a computer. You have to use a STB receiver and a portable TV outside with you while you align the dish so you can see the signal meter live as you adjust the dish. Or a portable signal meter, but those can be pretty expensive.
If you are around the Stillwater area in Oklahoma then I may be able to help you get started.
Have you ever done anything with FTA before? Remember, this forum is for legal FTA. We do not support hacking and/or pirating of subscription satellite services.
Check out this link for a good list of available English FTA channels on the Ku band:
FTAList.com - English Channel List
Those channels are on multiple satellites. To be able to receive all of them you will needs multiple satellite dishes or a motorized satellite dish. One stationary satellite dish can pick one satellite in the sky (unless you add multiple LNBs to one dish, but that shouldn't be your first FTA project).
I would look around your area for free dishes before you buy one. Lots of people have old Primestar dishes or hughesnet/direcway dishes that work well for FTA purposes and most of the time they will just give them to you. Elliptical and round dishes both work fine just as long as they aren't the small Directv/Dish Network dishes, which are too small for FTA use.
Also, this is some good reading to answer a lot of questions you may have:
http://www.satelliteguys.us/fta-mpeg2-faqs/