Don't feel the need to look at cycling specifics, look at ski and running etc stuff for layering, you can layer anything over your shorts for a start, you can use running gloves or other sports gloves, make sure you have stuff that wicks well because trapped in sweat makes you cold, and find wind proof too. Costco here has tons of winter stuff for the ski season. Get wool socks and ditch your thin bike socks, a friend cuts a hole for the cleat in thick wool socks and uses a pair over her shoes old school style. I have a beautiful PI winter weight jacket and I never wear it to ride because it is too thick and stiff, I layer and top with the PI light rain jacket. Consider a balaclava, because your head his really vulnerable to cold. Layering is key because you often need to adjust on the fly and you want stuff you can put in your pockets, a thick jacket won't do that. Also as it gets darker think about visibility and reflective fabrics. 30s plus is really doable if it isn't wet. Look what you have in your closet first. Anything that wicks, breathes and has some kind of wind block is great. If you are cold, pedal harder LOL.