Search the forum for PETG and you will get a lot of results and also settings.
Have a look at this comparison of 3d printing materials:
I normally use this settings:
Heated Bed : 80°C
Nozzel Temp: 235°C-250°C
First Layer Speed: 8-15mm/s
First Layer Height: 0,2mm
Printing Speed: 30-50mm/s
Layer Height: 0,2mm