While some New Jersey leagues have two year divisions, most tournaments do not. If you are a Division IV, U12 team, you cannot play in an U11 tournament even though you may play U11's in your league play. Review the level of teams being invited. If you are a lower division league team, you may have problems at a tournament that is inviting state select teams. Call the tournament director for advice.
Most tournaments are for club teams.
That is, the team that you played your regular league games with. That team now becomes a tournament team. However, before you consider taking guest players, make sure the approved Permission to Host Agreement allows guest players. If the Permission to Host Agreement does not specify that you can have guest players, NJYS can not approve your permission to travel with guest players. Regardless of the tournament specifications, NJYS will not allow more than five guest players on a tournament team.