Pizza delivery is great, I make 11-15 an hour. Thats as good as some collage grads I know. Its fun and you meet all kinds of people. The best advice I can give is to goto an upscale area, even if it means a longer drive, as tips are everything in this line of work. If I had it to do all over again? Why not, I love what I do. The big thing to take into account is wear and tear on the car and fuel efficeny of the car. If you know how to do basic stuff yourself (fixing breaks, changing oil, changing tires.) It can be great, but if you pay somebody elce to do it and your car drinks gas, it might not be a good idea.
You really need to like people. If i had to do it over again, i would because its a great place to gain interpersonal communication skills. The pros are chances to communicate alot, the cons less money than a desk job. Watch out for stocking nights, they take a long time