The Pawns are always the smallest of the pieces, and you should have eight of them. They will go on the second and seventh rows. White on the second row (a2, b2, c2, d2, e2, f2, g2, h2) and black on the seventh row (a7, b7, c7, d7, e7, f7, g7, h7).
The pawn is my favorite chess piece and also a very unique one. The pawn usually only moves one square forward. The pawns have the ability to move two squares forward if they have never moved before and only one square forward afterwards. They can also just go one square forward on their first turn. They are the only piece that cannot go backwards, and also the only one that attacks differently than it moves. A pawn attacks on a diagonal.
The white pawn on f4 captures the black pawn on e5 and takes over its square.
Attacking in chess is different than in checkers, as the attacking piece does not skip over the piece, but actually captures it by taking over its square.