In section 141, rows B-J have 11 seats and rows K-X have 12 seats. Seat 1 is the right-most seat for each row when facing the field. Seat 11 or 12 will be the left-most seat depending on the number of seats.
Down the line seats (also called Field Boxes) offer field level views at a lesser price than infield seating. Seats down the right field line -- especially in sections 146-148) offer zero protection from the sun for afternoon and early evening games.
Target sections 111-115 or 140-144 for you best chance to catch a foul ball.
The Royals bullpen is adjacent to section 148, while the visiting team warms up adjacent to Section 107.