This question is confusing to me. When I completed undergraduate chemistry, I have no introduction to: naming, arrow pushing, and the like. The definitions of SN1, SN2, E1, and E2 were taught in basic first years Organic Chemistry I courses, which the O.P. is currently taking, not in Undergraduate chemistry. Starting with their current textbook, the O.P. should try to figure out, what they seem to be having problems with now, and ask the more definitive questions.