enter into

US /ˈen.tər ˈɪn.tuː/
UK /ˈen.tər ˈɪn.tuː/
"enter into" picture
1.

to begin to be involved in or to take part in (an activity, discussion, etc.)

:
They decided to enter into negotiations for a new contract.
I don't want to enter into a debate about politics right now.
2.

to make a formal agreement or contract with someone

:
The two companies will enter into a partnership next month.
It's important to carefully review the terms before you enter into an agreement.