its been a good while since i played mhfu, i play it every once in a while and get a lil further lol
im like, past the lady quests, ive did like, i think almost all the first guild ladies quests, and im on the hr quests from that cat beside the old lady lol
as for best ls, i really cant answer, im not a big ls user, id just say get the elements that work against your enemies and upgrade them as much as you can without needing high rank materials.
oh, and, Welcome to the forums! ^,^/