Yup, buy yourself three or four 5-gallon yellow Diesel jugs and you'll need to fill them up every month or two. My L3800 (slightly larger engine) runs for about eight hours of work at various speeds on a tank of gas. That's a load of work! You'll likely not be using your tractor eight hours a day.
You might consider Stanadyne Lubricity formula to keep your fuel friendlier to your fuel pump, thanks to the low-sulfur diesel we have today. You can get it off Amazon and a gallon jug will last you years. A shot glass in five gallons keeps your fuel system happy and your pump healthy. No real need for fuel stabilizers unless you store your fuel longer than 8 months. Keep the lid tight to keep moisture out. Stored in shade and in cooler climes it lasts a long time.
Also, if you have power available up there, a battery tender/charger is recommended to keep the battery topped off between uses. Always disconnect the charger before starting as you may fry it when the on board alternator kicks in after start. Definitely use 15-30 seconds of ignitor heat before a cold start each morning. If you don't have AC power available, a solar panel may help keep the battery topped. They are available for under $40.
Do you have a covered storage location for the tractor? Hopefully, if not you might consider a cheapy Harbor Freight auto shade structure but stake it down doubly well for high winds.
Have fun and welcome!
Ray