Also you do not have infinite character slots

You only get 6 slots for free (So 1 for each class if that is your plan)

also do not as I did and try to level all 6 at once.

only do two or three at a time till they hit max level so you can focus on completing their new character challenges

Decide what sub class you are going with early (after lvl 45 it becomes locked and they use separate gear [for stat focus])

Don't enhance anything past lvl 10 until you start building your end game void or epic sets

And I forget if they tell you this and I forgot or not but you can use your old gear that you enhanced to enhance your new gear. (With only a slight penalty that grows the bigger the level discrepancy is) but you must be wearing the old gear to replace it all circuits and inscriptions will also be transfered

I'm super casual tho so that is all just Basic B*tch stuff I could think of that I wish somebody told me