The equipment while new to you, is used and would be 7 years. This begins your use of the tractor. You deserve to get your money out of it. You are depreciating the tractor over a 7 year period based on what you paid. If the tractor does not last that long, you would do a disposal to claim the rest of the money. If the tractor lasts longer than 7 years, you got your money out of it.
The tools could be supplies or may need to be depreciated, depending on the cost. Invoices/ costs under $2,500 can fall under de minimis rules and be written off, not subject to depreciation. See Tangible Property Final Regulations | Internal Revenue Service & Reform Changes
[Edited 3/9/2021 | 11:43 am PST]
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