What to pump as you level (2moons gold) to get your first summont out and the Basic Setup for when you star are very nice. Pretty much the reasoning behind this is clear. Pump Twin Mastery as soon as you can to do the most damage you can at your level. And Maxing Blade Spin helps to help kill monsters faster, and don’t level Evolt Shot/Cross Hack, because they have a low out put damage, even at max not really great for TBs, but it is useful to lure monsters to you/poison them.
To get Tarantual because it is easier to level (2moon dil) with him. He does poison damage which not only is ranged, but it poisons the monster, making them die faster. And in General Libido is better than Beast.
What to Pump in Between Posted Skills:
Pretty much pump Tarantual and Alde for Pets, and Pump Twin Mastery, Blade Spin, Devil Swing, and Blood Bats and Skin of Foreign Realm, after learning Spirit Dagger, Blood Bats and Skin of Foreign Realm between Level (cheap 2Moons gold) 15 and Level 43.