So, it changed a bit recently. Before, it used to be that the face-to-face sessions were done by the area associations, but with the modernisation project going on in Wales at the moment, things are getting more centralised.
My understanding is that the face-to-face sessions is the practical element of the course. So, it should be teaching you things such as positioning on the field of play, whistling technique and so on. I think, it may go through the admin side of things with you, but I'm not entirely sure on this one.
It will get you registered for the season, assign you your official number, and put you in touch with the relevant local leagues to get started (if you're not already in contact with them).
Registration is fairly quick, so you should be able to be allocated games ready for the following month as the games tend to be assigned on a monthly basis. However, if you're in touch with the local leagues you may well get some games within the week following registration assuming there are free fixtures, and it is likely that there are.
Don't sweat the face to face session, it's just there to tick things over and get you ready for things. Use it as an opportunity to ask questions and get to know the other new recruits!