I checked shipping rates to Nigeria from USA. Reasonable sized box, 3lb maybe, would cost around $60.
Yes, fairly expensive, but perhaps someone on here (me even) would be willing to send a package of stuff, if you knew what you were interested in.
In your case, it may be worthwhile to stockpile as many components as possible. If you had access to a fast, local distributor (like Digikey/Mouser here in the US), then the consensus (these days) would be to *not* stockpile components, and instead buy as needed. However, since shipping will be slow and expensive to Nigeria, perhaps building up a diverse collection of parts would be in your favor.
How slow is shipping from eBay? (China, I presume?) For instance, if someone in the US purchased a collection of inexpensive parts from China and sent them to Nigeria, I can't imagine it taking less than 2 weeks total. Is it slower than that?
What is your focus? Are you just starting off, trying to learn?