2-7 questions

[Wintergedaerm]

HI
i recently started playing 2-7 on stars.
I just dont really know how to handle some situations from sb and bb.
Is a 3carddraw like 23 or 2-7 enough to call a raise from the bb or to fill up from sb?.
What hand do i need to call a raise if i filled up the sb and the bb makes it one more to go?
thnx in advance for any help