Drywall is cheap and it doesn't cost much to patch it if/when you get holes.  

It will need:- New floors throughout the house- New roof- New deck- Paint, possibly even replacing dry wall (there are stained yellow patches throughout the home)- The basement to be finished- Brand New Kitchen- Brand new bathroomsI do not know the first thing about carpentry so I would have to find a reliable contractor but how do I find out the general cost for projects like those listed above in my area?

Being handy can decrease the safety reserve required for a novice just starting out...If you have a problem and you know that you and youtube can fix it competently for the cost of materials, you can trade your time for money and spend your weekend digging up that sewer line, patching that roof, replacing that window, or running some pex-- but hey at least your are working for yourself and you can get started with less cash. 

I know some investors that went through a rough patch during the pandemic.

Every time you patch the drywall it looks worse.

If the roof is leaking, patch it or replace it.  

It's come a bit off its piles and needs a jack and pack, 108mm slope across the whole property, 8mm less and the insurer would have patched it up at the time.We have some reasonable estimates (I will be getting some solid quotes in the next few months) and we are confident that we have enough contacts to get it done.After that it gets a bit murkier, The property hasn't seen much of an update in the last 20-30 years so theres a lot that we COULD do, if we had a more solid idea of how the demand is for properties on TC3 land (i'm pretty new to this, I wasn't expecting to buy a house for a decade so I have been on a bit of a crash course the last few months).

We're not all fighting over the same little patch of turf- that's one of the things that makes the sharing of info so easy.

I still netted $27k on the sale but I admit that I did a lot of the labor myself since demo is fun and it's not that hard to paint and patch some holes.

But for $4,000 total I'm assuming it was close to a full roof replacement vs just a small patch.