Manychat automation and setup necessary links or integration

Hello my name is Denny , I just started my apparel website and like to setup necessary many chat automation,
( a more professional welcome message flow )and link to my face book messenger, I will setup the face book store as well.
I am using open cart platform for my website, not sure if many chat do any popup message on it.

I am new to many chat , not sure if your offer of 155.00 can cover above or have additional functional

thanks
Denny