"When looking for a research assistant position, you can expect to be interviewed about your education in the field of research you are applying to, your clerical skills, and your ability to work independently under tight time constraints. The interview and job expectations as a research assistant will depend largely on the scientific field you intend to research, so be sure to look into the expectations of the professors or other senior level researchers you may end up working under. Most research assistant positions will require you to have at least a bachelor's degree in their respective fields."
How do you pick a site for a particular study as a CRA?
Talk to CRAs you know; talk to the investigators you know; check the FDA website for black list of investigators; journal search; level of interest of the investigator; how quickly he get the paper work ready.......are a few answers I mentioned.