from the ground up

lay the groundwork

To create a foundation; to provide the basics or fundamentals.

from the get-go

From the very beginning; from the outset; immediately upon starting.

jump street

The starting point; the very beginning.

from the word go

From the very beginning; from the outset; immediately upon starting.

head start

An advantage consisting in starting a competition or task earlier than…

from scratch

From the beginning; starting with no advantage or prior preparation.