I'd start with a ku dish just to get a feel of the hobby. If you find a good c-band dish (7-12' diameter) I would surely ask about it too, but going in several directions at once may be frustrating. Look around your area for an old Primestar tv satellite dish, they're gray and haven't been used in years, but make excellent fta dishes for ku. They were made in several sizes, the 1m dish is fine for free to air ku signals. People will sometimes give them away just to get them out of their yards (I have about 5 of them lol). The small dishes can be bought also, check out sponsors at the top of the page, some may sell a package with dish, lnbf and motor also. The horizon-to horizon motors for the small ku dishes can be adapted to use with the primestar dish, but that is a project in itself. Ask here if you find a likely suspect for ku, abandoned stores, gas stations might also yield a good ku dish for you.
If possible, mount on a pole, ground level, easier to set up and work on. These motors can be controlled by the fta receivers, using the coaxial cable that passes the tv signals, and select channel polarity by varying the dc power levels.
Don't confuse 'small and medium fta' with dish size. The c-band dishes, 6' and bigger can do both ku and c-band if equipped with the right lnbf. Fta receivers can do both c-band and ku band signals, c-band just needs a bigger dish to receive the signal. Fta receivers can also control a big dish's movement if used with the 'gbox' controllers available now.
Many of us have had c-band satellite for years, and continue to use the older, analog receivers to move the dishes because we already have the equipment.