Please do not take offense - It really sounds like you need to get your
priorities straight.
First it sounds like you need to make sure your house doesn't fall down
You probably have a leaky roof if I were to guess
You probably have a lot of exterior maintenance like rotted window
frames, etc. Tell me I'm wrong.

So - First make your house structurally sound. Then weather tight, then
fix the aesthetics. Remove the fireplace if its a safety thing. Do not
use it unless its been fixed properly.

What I would recommend for you. Please take my advice, it will be well
worth it.

Hire a good home inspector or a good general contractor. Pay them to do
a top to bottom inspection of the house. Ask them to note all the
problems, and potential hidden problems. Then ask them to prioritize
them for you, most critical first, on down. Pay well for this. Use this
as a road map for your renovations as you are able to do them. Do not
waste yours or anyone else's time buy getting free estimates on fixing
a chimney when there are likely other priorities. I have paid to have
this done for a family I was helping. They had asked for some help with
a new tub (Aesthetic repair). When they also had roof leaks, water in
the basement, crumbling front steps, rotted windows, etc. I helped them
get their priorities straight and they are doing what they can, as they
can.

What's the expression? Its like arranging deck chairs on the titanic.
Or, Its like fixing a fireplace on the titanic!

Good luck