Thx, and the npc you talked about is the one with the monk-like skills? How are those useful for a strength-charmer?
Zo, the lupine monk lady, teaches you 7 skills in total.
Equanimity is a stance that raises your crits (both the crit chance and scaling) the most out of any individual crit buff you can get. Good for almost any build that can afford to have it occupy the at-will slot.
Intuition is a stance that provides a good buff to Evasion and Physical Resistance. A slightly diluted version of the Duelist Stance that is available a level earlier (at 3d instead of 4th), so it is useful for any Charmer build that trades physical blows with the enemy.
Influence is an Encounter power that deals a really solid chunk of crushing damage while silencing and disarming the opponent, and it isn't dependent on your weapon's damage so it works even while your character is disarmed. You will be giving up the class's main Resolve nuke (Song of Splendor), but it is a good non-magical alternative for fights that you will have a hard time (or straight up can't be) winning by targeting Resolve.
Tranquility is an at-will stance that provides a Resolve damage resistance and a hefty passive Resolve recovery. This is less versatile than the Resolve healing class powers the Charmer gets, since it can't target your companions, but it is a much bigger heal, so if your Champ is getting Resolve nuked by enemies it is useful.
Equilibrium is a niche at-will stance that mostly provides you with immunity to Prone and Disarm statuses. So it is situationally useful for all classes in fights where your Champ gets targeted a lot with those abilities (and where the enemies don't stun you, because stuns cancel the target's stance).
Exertion is a bad power that should feel bad.
Guidance is a very weird at-will healing power that restores 25% of your companions' max Health and Resolve at the cost of 15% of your own. It's a risky move, but if you have a good tank+healer combo with you, it can help healing your team up after a nasty AoE. Probably not very good on Charmers, since they usually aren't rocking heavy protective gear and big HP pools.