I can teach you "Mexican Spanish". Also, along the way I could tell you about particularities and differences between Spanish as spoken in Spain, Chile and Mexico (not in the very first lessons though, of course).

I have experience in teaching Spanish and French in real life, either to friends or as paid lessons, and people say I'm good at it. I happily accept bitcoins. I'm not fond of using Skype because it's an obfuscated network with a central provider, and obfuscated spyware to install on your computer, but I guess there's no other way...