First, I have to mention that I have never done any house improvement and I am close to the 50s of my age

I bought a house (my first ever) and it has an unfinished basement.

I want to finish it by myself, no one to help, just by myself.

I am not in a rush, so I watched a few YouTube videos.

For the plumbing and electricity, I am going to use a professional.

Now where to start?

Shall I start with plumbing or electricity or can I start putting the frames for the rooms (by myself)?

Maybe there is some other thing I should do first?

Some photos

[![basement](https://i.stack.imgur.com/i8Kpo.jpg)](https://i.stack.imgur.com/i8Kpo.jpg)