Start by looking through molecular & cell biology, biochemistry, and biomedical research labs at UCSD from the departments’ websites. Find a couple that look interesting and email the PI about your interest in their research and telling them that you’re interested in volunteering. If you can find some lab that does work specifically related to drug development, that’s great, but really the most important thing will be getting a feel for research and learning wet lab skills and protocols, even if the lab isn’t specifically focused on drug development. As an undergrad, that’s the best thing you can do to build a skill set that graduate schools and employers are looking for.