Obviously they have to be more independent, plan for homework, remember to takes things in, although even now a year later, I still like to show interest in what she's done for homework and roughly when it's got to be. If you live near school, but aware, you may get phone calls at break times asking you to take something to them there and then!!There will be a lot more homework! She enjoys break times more, as they have a lot more freedom to eat when they want, meet their friends where they want.
My daughter finds the teachers a lot approachable. She's aren't any she doesn't like and she is happy to go and find them and ask, whereas she wouldn't ask in primary school even though the teacher was in front of her.
As someone said, you're intrigued over their new friends. My daughter kept many of hers from primary school, but has met two lovely girls who just enjoy being together, are polite and everything you would wish her to have in a friend, so you don't necessarily need to worry. I thought many of the girls would be in competition over who had the nicest clothes, hairstyles, but there is none of that and no judgements how they each look. If she's gone to the house of a new friend or they've come here, parents have actually spoken to eachother to sort out a convenient time and confirm addresses. My daughter only lives 5/10 mins from the school, so we have a rule that if she's going to be more than 30mins late she has to phone me, sometimes she might go the library to be chatting to a friend, but anything longer I want to know about.
Someone mentioned they can buy whatever they want from the canteen. My daughter takes a lunchbox as that's what most of her main friends do, so no need to go the canteen! Having said that she does take £3 in case she forgets her lunch, there's a problem with it or she wants an extra drink, and so far she's only used it to buy extra bottles of water.
I wouldn't say you get a lot of letters home, but our school produces a monthly newsletter with lots of info in it and you can sign into parent mail for information on homework, house points, positives and negatives awarded.