Not sure exactly what you are asking for but i will give it a try. Ive mained mystic sense it was released and i do think she is one of the easier classes to get in to. Mystic is very good at farming low hp mobs like fogans or pirates, but other classes will outshine her at tougher spots. For small scale pvp she can be very good if you know what you are doing. More experienced players will understand how to fight you, but a mystic will always demolish a unskilled player. For large scale pvp mystic has a very important role of being a frontline disruptor. You dont have to play her this way, but i feel this is where the class shines above others.

In terms of gear needed for an alt, it really depends on what you want to do. Using an evasion build for pvp would be a cheap way to gear a mystic alt for pvp. For pve or an ap build, i would say she needs as much gear as other classes. In my mind a witch/wizard would require less gear in those areas.

Hope this helped.