I'm a primary teacher and mum...
If your anxious and sad that it's the end of an era and your little one is growing up, worried if they will survive the trials of school whatever you do, don't let your child catch on to your anxieties. Show a optimistic, excited, positive face that its a wonderful place. Praise praise praise- everything at first.. from walking into the classroom alone, to changing for PE to writing the letter o. children need praise even if you think surely after a month she should be doing more...
Show this positive, friendly, supportive side to your child's teacher. Teachers work extremely hard, you don't know if they are good or not yet and so go in with a non-judgemental attitude. If they're old- they're experienced, young- fresh, energetic, new ideas and motivated, if they're middle aged- best of both! If they're strict- setting clear boundaries and your child is likely to make good progress quickly, if they're relaxed- your child is likely to feel relaxed and work hard to impress a teacher they like.
Teachers are most likely to warm to your child if they remember you are the parent who always recognises their hard work. They will really want to help your child if they know you notice all they do and comment on it.
Help your child make friends by having classmates back after school on fridays.
Only go in to raise concerns when it really really matters, go calmly and try not to appear confrontational but instead ask for the teachers professional advice on how they think best handle your worry and whether they believe it is something you should be worried about.
Labels, on everything- and DON'T write to the teacher to tell them little Molly has lost her cardigan. Teacher's don't have time for it. Ask at the school reception if you can have a look with your child before/after school but the teachers are so busy dealing with more important things. Suprisingly you'd most probably rather they were marking your child's work and planning a fab lesson than looking for little Molly's cardigan for half an hour after school because mum's sent a threatening angry letter.
Get your child to school on time, it refelcts badly on their education, and on you. When they're a teenager and walking to school you can't expect them to get there on time if all of primary you dropped them off late.
Pick them up on time, do your best to get to plays, concerts, assemblies, volunteer with reading if you can. If you work try and be at parents evenings, summer fete, i used some of my annual leave to be one of the parents volunteering to help with the school trip when my now 11 year old was in reception and I was working in an office. DD really really appreciated it and loved it and because I normally couldnt collect her from school even, it gave me an amazing insight into her 'world'! Makes you understand just what they go through each day.