So 1 I will say get a good FC, and you will learn full DL isnt needed for titan, but it is nice to have, 1/2 darklight 1/2 AK is more then enough.

2, take your time, by the time 2.1 gets here you should aim to have had atleast 1/2 DL and 1/2 AK gear to start tower and further progression. At 2.1 I believe we will also see a few more lv50 dungeon content which will most likely give alternatives to AK.

Game is new, we are missing tiers of gear and to progress right now you must grind. just take your time till missing parts come out, or take a break from the game till it comes out if you do not like the massive grind that it is now.