best combo for pve, shadow, MKT, assassin ,etc.

just wanted some opinions on whats the best combo  of assassin, shadow, MKT, or any combination there in,(for pve)  also if  there is another skill set to add to one of these to make  it more solo-able , would  like to hear  some  feedback, looking forward to  hearing all your ideas, ty

also i know  its hard to level a spy, but looking forward to the challenge


also i am new to this class, any advice is welcome, loadout advice , clothing, etc.

i have played a MA, kung fu, karate

so this class is a departure for me

i know there  is a similar post to this one, but i am asking slightly different questions, and i didn't want  to hijack his thread

Not using Master Shadow tree to start with just the others.

spy is the best tree to level a character after you hit about level 33. At that point you have enough memory to load hacker, download mission map, disguise, suplex plus a few knifes. If you mish with someone else, especially a lowbie, get them to load hack. that will give you extra memory to load more offensive skills.

Stick to infiltration, courier or retrieval missions with the spy tree. you will be able to do missions in half the time.

k guys ty great advice