I agree with starting on tinkers construct. Then look up how to start thaumcraft and ars magica. All 3 of those mods have in game guide books. For the technical mods do a search for mod spot lights on them by direwolf20. Things like buildcraft, railcraft, thermal expansion, ender storage, applied energistics, steves carts. I would avoid Industrial craft 2 exp. Its changed so much and there isnt a wiki out atm that goes over everything. You could watch the direwolf20 forgecraft 2 season 2 play series. There is like 52 episodes but its for minecraft 1.6 and alot of the mods in this pack are the same or very similar.