Before buying anything, I would suggest searching google.com for the words...
FTA FAQ
Read all about this and learn all you can.
Learn about
C-band, Ku-band, lyngsat.com, FTA, different LNB types C - Ku, Circular, Linear, USUALS, diseqc, and dish sizes. At a minimum I would recommend a 100 CM dish (1 meter) for Ku.
Read the instructions for your receiver. If there is something you don't understand, search google.com and read about it.