Well, unless he has his commercial license he can't accept any money for his services as a pilot. He's limited to accepting what may be a proportionate share of operating expenses for the flight divided by everyone on the flight.
And even if he had a Commercial ticket nobody will want him until he has an instrument rating. No company wants a fair weather pilot only. And insurance companies usually want this too.
I was in the same position too. Things I did to build my time:
Advertised to some photographers and offered to fly them for aerial photography. That was good for about 20 hours per month and the cost of the aircraft rental.
When I had 250 hours I hired on with a small FBO and did some Part 135 charter flying after I took the 135 ride. I had my commercial and instrument ratings at the time. I also had my CFI and did flight instruction, but the number of hours was pretty spotty. You didn't have students every day and you only got paid when you had students.
When I had about 380 hours I hired on with a small package express company out of MDW
flying auto parts, t-shirts, you name it all around the midwest. That was the time builder for me. They had planes from as small as a 172 up to a Baron 58.
I stayed there until I built up about 1,000 hours and then hired on with a small company with a Lear 25 right seat.