My daughter started secondary school last September. She'd been bored at primary school and was more than ready to move on. She admitted to being a little nervous the first morning, but was adamant she was going to enjoy herself. I know alot worry about getting lost and bullying. My daughter did get lost quite a lot in the first 2/3 weeks, but there was always someone in the corridor to help, some of the older ones volunteered to take her to where she should be. There have been no bullying issues at all.
As for school uniform, get anything you want from the school school by mid July. If you wait until August, you'll be lucky to get it if they are like ours. Items that can be bought from places like M&S you can leave if you want. My daughter is fairly small so couldn't get a couple of items of school kit in the school shop. Had a word with the school, who were really relaxed about it and told me what would be okay with them instead.
She is now on her third bag. They have to carry a very heavy bag, so I'd get the strongest one you can afford (her present bag from Animal has lasted the longest) and I'd go for a backpack. My daughter wanted a fasionable bag when she first started, but soon realised a backpack was the best option.
She does wear Velco shoes (as do some of the other girls). Her feet are so small and an unusual shape so she has no option. I asked my daughter is she would wear a coat for school when it was cold, she said yes if it was black and has happily worn a coat I got from the Factory School. At the moment there doesn't seem to be any pressure from others over fashion.
As for PE kit, my daughter isn't very sporty and doesn't perspire that. she has instructions to bring it home if she knows it's dirty and it always comes home at the end of half term anyway.
She can carry her phone around all day (switched off in lessons), but it's recommended to hand in for PE.
She spends a lot of time on homework - about 3 hours a night but that's because she chooses to. Her friend has a friend who spends the same amount of time, but another one who limits it to 30 mins, so up to them how much effort they put in.
The worst being about this year has been friendship issues. All her old friends have had them. She had a few rough weeks when she was falling out with friends. She was one of the first to go through this and I was upset thinking it was her, she'd have no friends, but a lot of them have gone through this.
As Casey said, it's good to allow extra time for them the first couple of weeks, listening to them talk about their day, whats worrying them, helping them getting themselves organized, making sure they have time and materials for homework, as there's so much to think about initially.
I think I was more uptight that my daughter was about her moving on, so try not to let that show. Treat it was something exciting where they can make new friends in time, learn new things, perhaps have the option of doing a club they really enjoy.