I'm a permanent year 7 form tutor. I spend a lot of time in the first few weeks reassuring them that it's ok to get lost/find it a bit overwhelming/make different friends. I keep my classroom open for them to hang around in at break/lunch, and am either there or close by to make sure nothing gets out of hand.
First day we have a tour of the school (year 11s come and take small groups for us, and they make sure every pupil has seen all their classrooms for the day), I help them fill in their timetables etc in their planners, and we do a couple of getting to know you games (I quite like human bingo, finding things in common with each other). We practice lining up for fire drill, talk about other practices and security procedures (if you see an adult without an ID badge go and tell a teacher about it, that sort of thing).
Over the first couple of weeks the year 11 mentors come each morning and take the year 7s to their classrooms for the day so they get more familiar with the confusing layout of the school. We do loads more getting to know you activities in form time, so they get to know each other as well as me getting to know them.
I then have routines for each day. This year it's
Monday: assembly
Tuesday: planner and equipment check
Wednesday: silent reading
Thursday: tutor chats (I basically sit with a different group each week and check in on them to see what they're up to)
Friday: weekly round up (often discuss the week's news, maybe a quiz, they can tell me some of their news of they want to)
If we ever have a spare minute I have a selection of puzzles/brainteasers in my drawer to keep them busy and thinking.
I love having year 7 as my form. They are generally still keen to get things right, helpful, and love it when I give them jobs to be responsible for. I get loads more volunteers for house competitions than I ever did when I used to follow a form group up the school.
I have to say I don't do much in the way of contacting parents, because that's really not the culture in my school. Parents contact head of year or head of department, depending what the problem is. I deal with the kids directly. I am kind and a bit "mumsy", but I'm clear about expectations and can be very firm if it's needed.