First off, massive well done all. Now the hard work really starts. The course normally lasts around 12 weeks, a mix of classroom and practical work.
1st week will be mainly introducing you to the company and customer service training. Then follows PTS training in the classroom and usually an assessment at a maintenance depot.
Then it's back to the classroom for signaling, followed by traction training. After traction training if I remember correctly you will be out with a Minder (an experienced member of staff) following their duties for a few days and actually operating the doors. This is followed by the interim assessment with your CTM at the depot.
After this its back to the classroom for retail training and then back out with a Minder for a week.
After that it is then your passout assessment, which normally take around three days.
That's the hardest 12 weeks you will have but it is worth it. You will struggle with some aspects of the course, everyone does, so don't be embarrassed to ask your fellow trainees for help.
It's a lot to take in and is very intense. Just find the way to learn that suits you. Personally I soaked up as much as I could in the classroom that day then went home and didn't open my books until the next day for 30 mins in the morning.
Finally from a relative newbie, welcome to the railway!