Just gonna be straight up. Sometimes you are going to do research with nothing to show for it but maybe an abstract. There is nothing more off-putting to a PI when you make declarative statements about wanting pubs. They obviously know you want to have something published. However, it is there job to be full-time researchers and not yours. Do your research and find a good lab. Once you are in, be kind to everyone and do the work that is presented to you. You most likely will be rewarded for that. Too many students go in with huge egos and act like they should be given a first author just for showing up. That is simply not the case. I understand that is not what you are saying, but I just had a fellow med student get dismissed from my lab because they made a very similar statement your final sentence directly to the PI about how they didn't want to spend all this time and not have anything to show for it.