Want to leave my job for another but I just started.

Hi all. I recently started a job at a pizza place about a month ago. I'm not that good at the job so I'm easily replaceable. The problem is my boss seems to like me (met him through a close friend) and I don't really want to let him down. Recently a couple people have quit and I don't want to understaff the whole place. I don't get paid much either. This is my first job, but I already have another job lined up that pays better and would be better for me because I can do homework at the other job. How do I go about doing this? Do I just give my two weeks? I don't know what to tell him.

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