I got a kit from FitRite Hydraulics that was the valve and the top and tilt cylinders. He makes the cylinders custom to your tractor model and fabricates a mounting bracket for the valve. On mine he left the hoses for me to purchase locally.
I highly recommend him if you have the time to wait, but the valve can be done yourself with a little knowledge gained by asking questions and reading about the equipment. He will sell just the cylinders or just the valve as far as I know, I just got everything at once for simplicity.
Summit Hydraulics is also a source for kit solutions but I have not used them myself.
If you already have a front end loader you will just tie into that hydraulic system with some fittings and hoses. It is generally very simple and straightforward to understand where to connect to since the valves are usually marked well.
Good Luck