1. Try out all the weapons, there's a whole lot and one is bound to fit your playstyle. 2. Lance is great if you're struggling underwater because of its block and dash abilities. 3. Don't invest in too much Low Rank equipment because that stuff gets outdated fast. Save your stuff

AFAIK, Hatsune Miku is only in the (now defunct) MMO: Frontier :( Hope you have fun, though! MH3U Is my personal favorite :)