[Gianni Gentles]

So, the question is:
Do you have any advice, how to survive the first corner.

It might sound obvious but impossible to do but....
Try to make as much room as possible for yourself. 
You need to know what's going on all around you. Minorating or car radar is essential for that.
Put yourself into the biggest space possible with a buffer zone in front of you. Don't try to be as close as possible to the car in front unless you're certain there will be no collisions. 
Show your brake lights early without slowing down. This should make the car behind back off early giving you a chance to catch the car in front without fear of being rammed.
Make sure you have an escape route, even if it means going off track and getting a slow down penalty. 
Choose inside or outside and stick to it. Don't get stuck in the middle or you're sure to get hit. 
Don't be scared to slow down or use your brakes to avoid getting hit. Too many collisions occur because everyone wants to beat everyone else to the first turn. Sometimes slower is better.
And last but not least, try to predict where people around you are likely to go and be as predictable as possible yourself for others. Collisions usually happen due to a chain of circumstances with one culprit making a simple mistake. 

PS crashes happen in professional motorsports too so don't be too downhearted when you do get hit. Dust yourself off and get back on track. More track time = more experience = less crashes.