PETG (also called copolyester) is a modified version of PET. The modification is achieved by adding a second glycol during polymerization. The molecular structure is irregular; the resin is clear and amorphous with a glass transition temperature of 88 C (190 F).
Most manufacturers recommend a temperature of 220 to 250 C for the hotend. 230 to 240 C is a good place to start your first prints.
Take a good look at the first layers: If the material isn’t extruded somewhat sluggish, you want to raise the temperature a bit. Also, you should start with a low speed of just 15mm/s and work from there to find what works best with your material.
Blue painter’s tape, with or without heat, is the best surface for printing PETG. The finish on the bottom is fairly smooth, but not glass-like.