Africa is not normally a place where you find a job "browsing the web". Get a ticket, a fancy backpack, a passport, a credit card and a few USD... And don't forget to bring the follwing too (essential).
- The right, open attitude.
It is always tough for 250 hours guys to get a job but right now, it is tougher so a "go getter" approach will just bring you where few others are. Then it is personality and persistance.
It might not sound like much but when you have not very much experience at all to offer, those a skills some employers (some good ones and bad ones alike) will consider more valuable than your lack of hours.
As for building time in a 152. Well, I'd say it is better than nothing but make sure you keep your IR current against 100s of hours on a 152 paid of your own pocket.
Good luck.