What have you got? You might not have a strong local VC community, but you do have something the Valley doesn't - a very low relative cost of living. With an international market, you can sell a service at 'Western' prices, and spend it at Nigerian prices.
Unless you can move to a startup hub, you're unlikely to get investment, at least initially. So it's going to have to be a bootstrap job. Get a merchant/PayPal business account, get paying customers as soon as you can, and work towards self-sufficiency. Once you're there, you can look towards expanding, getting investment, or moving overseas if that's what you want.
You're in no worse a position than many bootstrappers here - but, thanks to your location, the bar you're shooting for is lower. Exploit it!
And get on a jet aeroplane to somewhere where the hill to climb to a better life is significantly smaller.
you will get more help if you are more open.