The word you are looking for is Adapa.
It's five letters, ending in A.
Adapa is a Babylonian demigod who was believed by the Babylonians to be the first man on Earth.
The first noun in your sentence is 'letter', ending in 'r'.
First or Worst
d (debut)
raj
veni
sert
vi
skill
A....affluent
a for affluent
Rich
A for affluent