From South-Mexico to California by bus? Help from Mexicans please!

<p>Hi. Any advice on crossing all Mexico and going to L.A. by bus?
What buses should I take?
Any schedule. Tapachula-DF, DF-L.A.?
Like how much would it be?</p>

<p>Thank you</p>

<p>(I'm not Mexican but would easily get to South Mexico)</p>