The 2 things to get, just get, are a tractor and/or and excavator. Easily sourced and resold, easy to learn, extremely powerful, and sooooo useful. Self contained businesses. Rent them contract yourself with them, and used every single day on land management. Both extremely extensible with attachments and so on. The bases for hydraulic scale penknives. These are the 2 things, a tractor, and a digger.