You can probably forget about having much free time on the weekends unless you like to stay up very late at night during the week.
For me, I would try and do most of my work for the upcoming week on the weekend. I was never good at coming home after class and doing much of anything (except sitting in front of the TV to unwind a bit before bed). I tried to read cases during lunch at work (and brief them as much as possible then, too), and do the rest of my work on the weekends. Your legal writing course should keep you pretty busy first year, so you should expect to have to do a lot of research and writing papers. That, itself, kept me the most busy. It wasn't uncommon to start working on a paper on Friday evening and still be up until around 1am or so on Sunday night finishing it up (then still re-reading and editing during work the next day before class). I would try and take some time off on weekend afternoons to spend with my family, but I ended up sitting in front of the computer for a good number of hours during the days, too.