While different sized fields may be used for different age groups, the field is always longer than it is wide.
Try to find key clues to help you during the game.
Is the field long and skinny so you may have lots of traffic down the middle and plenty of throw-ins?
Is the field short and wide so the two goalkeepers may be able to kick the distance of the field or a direct free kick goal from a kick-off is legitimately possible.
Most youth fields are not perfect. Realize that and deal with it.
If markings are hard to see or not painted correctly, do your best to correct them.
If the nets have holes, ask the home coach to try to repair them.
If nets or corner flags are not available, they are not mandatory but realize the extra work that may cause the referee team and point it out to both coaches.
IMPORTANT - If you believe any situation is unsafe, DO NOT start the match until it can be repaired. This is especially true for unanchored goals.
The lines are part of the areas for which the mark the boundaries.
For example; in the graphic to the left, the penalty area is shaded light blue. The lines of the penalty area are gray because they are also part of the area.
That means that as long as a ball is touching any part of the "gray" lines, it is still in the penalty area.
This example is true for all the lines on the field of play (touchline, goal line, halfway line, corner arc line, goal area line, center circle, penalty arc)
Importantly, also note that the penalty arc is NOT part of the penalty area.