The bus terminal of Bell Travel Service is at Pattaya North Road, just same location of Roong Reuang Coach bus going to Bangkok. Their small van can pick you up at your hotel based on web booking, not only to go ther bus terminal directly.
If you go the terminal by motorbike are car, you can use parking lot just close to the terminal.
The left side is depot of Roong Reuang Coach. If you turn right. you can reach depot of Bell Travel Bus Service..
Website of Bell Travel bus service