先ず第一に念頭にあるの英語

to begin with

for a kickoff

for starters

Firstly...

of something, being the most important

a preconceived notion

be there first

a product that was produced first, called a primary product

to be the first to do something

at the beginning

a person who has the first turn at doing something

first; before anything else

the first place one passes

to look unprecedented

being ranked as first

from the outset

a first step in starting something

a person who starts to do something at first

the action of doing something for the first time

in a rotation of duties, the first turn

I must observe in the first place that...

of something, being situated at the No. 1 rank

the action of saying something first

to hold the first place

having existed from the beginning

the first thing

have little or no respect for

being or showing energy only in its beginning

Could be better could be worse.

from the beginning