OP, if you are going to centrally heat this house, you need to be aware they were not built with this is mind.
When we did similar projects on houses we were advised to make sure that every room had a steady air supply running through which is obviously cold and draughty in the winter. You will either need air vents/bricks in the outside walls or if they exist already making sure they are free of debris.
These houses need to breathe and can produce lots of condensation if heated and double glazed, hence the need to rotate the air.
They should also not have cavity wall insulation.
I think its a great opportunity and wish you well, but if I could advise anything it would be:
Don't assume you will be able to do what you like, you may have to compromise
Take your budget and double it for a reasonable figure of costs.
Every job you have done/ do yourself will create at least one more job from this.
Double your time frame for realistic time frame, considering what could be held up/ not go to plan.
Finally, you need to know what you are doing, take advice, and seriously do your homework.
It costs twice as much to get somebody else to do the work, so anything you can do yourselves will save you money.
On a positive, we knew nothing when we started our first house and now we can do everything except fit boilers and electrical.