Good work!
My parent bought a six bed ex-nursing home in 1976 when I was just 11.
It had been repossessed, then squatted in and then empty for two years and had the planks nailed across the windows etc.
Me and my dad’s first task was to rip up all the carpets and take them down to the local dump in our Ford Anglia estate. I can still remember the stench as I hung my head out of wide open the passenger window.
But it was worth it in the end as will yours be. I’m by no means an expert but with something the size of yours I would recommend prioritising and tackling small areas at a time e.g. get the kitchen done first and then the living room etc.
They don’t need to be perfect, just enough to allow you to live a normal life so you don’t feel like your whole existence is on a building site you can always revisit and upgrade as you get more of an idea of what you want.