First job pricing

I got an offer for my first job, by a family… I haven’t finished the course yet - what’s a normal rate for me to charge?
Also, should I charge by hour or space?

Sorry-I had responded to this post but then realized that was a pricing question on interior design and not graphic design, so I’ll let the interior experts respond instead!

What kind of job?

Updating a house a bit for a small family - more aesthetics than real building… probably drawing plans, a mood board, getting furniture, maybe changing lamps/flooring…