I've had six laser sessions on my beard area so far. I use cream on my face twice daily, and I just apply a little more than usual after laser because my skin tends to feel drier the first day. Applying cream also supposedly can help 'loosen' the hairs once the shedding phase starts (between 5 and 11 days after your laser session; for me, shedding usually begins a week after the appointment), though I'm not sure how true this is. Nonetheless, you want your skin to be as moisturised as you can, since the laser can not only dry it out at first but can also cause some people to break out, which has happened to me a few times. Basically, just take care of your face a little more than usual.
You need to avoid too much sun exposure after each laser appointment, but it doesn't mean you can't come into any contact with sunlight, like Nosferatu. You just need to avoid a lot of direct exposure, as you might get from sun-bathing. Sunblock can work, but I've always just used my foundation to cover up my face, since you can apply makeup immediately after laser sessions, and it blocks out that kind of exposure.
Also, avoid trying to pluck out hairs a few days after laser. Sometimes, hairs that still seem 'rooted' in your skin will shed a few days later, and it's safer to just let them come out. Exfoliating your face and rubbing in circular motions from about five days on will help remove the hairs, and once the hairs have started shedding, you can test plucking individual hairs if you like--those that come out without any pain are the ones that the laser successfully treated.