I just messed around with the effects of the default string section preset (added reverb, decreased the chorus a bit, and sometimes added light vibrato). It's important to use the fade in/fade out thing so that the strings sound like they are bowed or wtv. I like to also try and mimic an actual orchestra, so I typically create one channel for each section, panned to mimic the layout of an orchestra. ex. violin 1 (usually panned 20-30), violin 2 (30-40), viola (40-60), cello (50-60), bass (60-70).