Get in a guild ASAP.
You should immediatly start doing weekly Mercenary Badge content (Uphill very hard, Remnants of Bernice, maybe some Gem Stone Feud daily). This will net you enough mercenary badges to buy 5 CM resets, 1 DM reset and 1 singularity reset every day (get all of them).
Now the “grind begins”. You do 6 CM’s every day (optimally in party on the ep12 maps - Sajunga Road or Vieni). Try to sneak in some parties (even if your gear is not the best) and get carried. Otherwise you can do solo Challenge Mode on OuterWall District 15 as well (stage 1-5).
Remember to ALWAYS do your daily free CM and get the resets (it is really important, even if you are not going to play ToS on that day, just login and get the damn resets)
You can also start doing the legend Skia raid (lvl 420+), but the drop prices are very low due to the new update.
You can get your initial gear and do content with more ease very fast (Varna legend is very cheap nowadays). Use ur guild to help you!
I’d say:
get a good weapon (+16 if u can)
Then varna armors with set effect (ataka/smugis if you are DPS)
Then acessories (drakonas is fine)
Then Boruta Seal 3
And you are good to go
I mean i cant tell you everything here cause there is a lot of stuff to do, but thats it
good luck!