I'm relatively new to this thread too - have only recently been diagnosed with PCOS after trying with my DH for 8 months and no result. I haven't yet started my Clomid but I'm sure the other ladies will be able to help you out with the side effects. Seems as if it's really different for everyone so hopefully you find it ok!
I think the alcohol thing is a personal choice. I really enjoy a glass of wine or two and am trying to keep my life as normal as possible outside of the craziness of TTC so haven't changed my habits too much. But I totally understand people deciding to go the other way too! I think if there isn't anything stipulated in the packet than you should be fine to indulge if you want to