The Official Monster Hunter 3 Ultimate Topic

Tried the demo and I already like the controls better than the PSP one I played.

Also I quite enjoy the dual blade / bows. Going to try a few more weapons out but definitely ordering this in a few days. Shame the 3DS one doesn't have online though, I don't have a Wii U

At least unlike the Gen 1+2 games, the online lobby stuff is possible to solo if you have to. Might want to make some friends that have 3DSes though =P.

In relation, after many failures, I finally beaten Querpy! God, what a hard boss.

So, how do I extend my rank?

I assume you mean ranking up. You have to do certain quests in the highest unlocked star level you have (So to get HR2 you need to do 1* quests), and eventually after you do the right ones you will unlock an Urgent quest. When you beat it you rank up. It's the same principle offline but no actual rank, you just unlock the next star level.