A 9n is geared too high with the 3 speed for what you want to do.
The FEL can be somewhat replaced with using a pond/dirt scoop on the 3 point. It makes a good carry all also.
I have had 2n,9n,8n, and now a 64 Ford 2000. It is so much better but sets months at a time as I use my Kubota
L3301.
The 9n/2n is better than doing things by hand and foot but it has been improved upon so much that they are really not the workhorse you appear you will need and another would suit you better.
You can buy a lot of tractor that would serve you better for 4K.
That FEL is nice but farmers and landowners have made do without for a lot of years.
Those implements you found on the place will probably fit other tractors. The n series used the Ferguson 3 point system that became the standard so most implements can be used interchangeably.
Look for
Massey Ferguson 35/135. Used all over the world.
Ford 600 series
John Deere but that green paint tends to be expensive.
Live PTO and at least 4 speeds or a Sherman underdrive would be a minimum requirement.
Diesel will sip fuel and will run forever. But cost more. And if they break, usually expensive.
Gas would be better for first timer.
My 2 cents.