Ok, ds1 started year 7 last September. I trawled through every bit of information on the thread from last year, linked further up this thread.
On the open evening I asked the teachers what sort of pens to have, and we were told no friction pens (ie the ones that you can rub out) because if they need to photocopy the work it will disappear with the heat 
Ds has 2 pencil cases for school, a main one, pens, mechanical pencil (no shavings) ruler, highlighters (specified by school) calculator -this is also specified by school so wait to see which one to buy. The usually offer them through school at a discounted price.
The second pencil case has a pritt stick, coloured pencils, maths equipment such as compass, protractor etc.
He never removes these from his bag at home. We have spare stuff here, that way he never forgets his pencil case.
He has Ikea wooden magazine files labelled with days of the week and removes everything from his bag and puts the books in the right file. Packs his bag the night before.
He has a notice board to pin up details of his homework and a daily planner of what to do today so he never forgets his music book or PE kit.
His front door key is sewn into his school bag on a long piece of elastic so he can't lose it.
Teach them to tie a tie if they need to, and shoe laces (although for his football boots and trainers he has locklaces for speed.
Walk the school route with them, make sure they can cross a road, and talk about what to do if they are worried about people around them.
And breathe
ds went to a school with only 1 other child from his primary, has settled in amazingly well. He has joined several clubs which allows him to make friends with different year groups etc.