Ask the person who offered you the job. Something to the order of, “I am very interested, what exactly would be my responsibilities?” Then you will have a better awareness of what to be proactive about when you take the job. I do think you should take the job you don’t have to feel like you will be doing that job forever if you don’t like it, and you might like it. I can’t see a down side in trying it.
Don’t wait too long to respond to the person who made you the offer, I say contact him today. Ask about what the position entails and then say you want the job (assuming you want the job) so hopefully he will discuss a start date for you and how much it pays, etc.