get on like a house on fire
strike up
ring up the curtain
out of the chute
cotton
début
get together
begin
hit the ground running
straight out of the chute
clean slate
get on with
snap to it
fly out of the traps
pitch in
inchoate
from the get-go
from the word go
reboot
off
outsetting
friendly
make someone's acquaintance
keep in with
instantial
get on
no time to lose
cut one's teeth
kick start
hit it up
get a jump on
hit it off
plunge in
steal a march
astart
get to know
flying start
exordium
running start
immediacy
repartner
revirginate
off the bat
step to
off the rip
in the blink of an eye
to begin with
in the twinkling of an eye
race out of the traps
beginner