We start with the house and the tenancy: who lives there, what the lease says, how access works, what rent and deposits are involved, and what timing you are considering. You can talk through a sale without first solving every notice or possession question.
We buy houses as-is, in any condition — no repairs, no cleaning, no cleanout required to sell to us.
You don't always need to evict to sell to us. We buy houses with tenants in place — we've done it many times, including cash-for-keys when that works better for everyone.
Cash-for-keys is a possible agreed payment for a tenant to move out. If it is part of the discussion, the actual agreement and its terms belong in writing and should be checked against the lease and applicable process.