I will then send you confirmation of a place and ask you to send your entry fee. Your place is only guaranteed when your entry fee has been received.
Juniors are welcome to play, and age is irrelevant.
You must play at least five rated players in one event, and four in another. Your rating will be calculated by the organisers and published by FIDE in January or July. The number of points you need to score in any given tournament is dependent on the average rating of your opponents - this is what is called the category of your tournament. The higher the category the less points you need to score, but the stronger the opposition. It doesn't matter who you lose to, or who you beat.