You need a game plan (as OldDog says). Sealing the house from the weather is a good start. However, if you are moving vent stacks or reflashing a fireplace you want that done before applying a new roof.
Renovation is done in stages from structural to finishes. If you have gutted the building, you can redesign rooms, install or remove headers, run new electrical and plumbing. However, you can also install new windows and outside doors.
Pictures would help and so would your wish list.