My experience with steelhead is it’s usually on or it’s off. Very tough or pretty good. Probably the biggest thing you’ll need to be concerned about is the amount of flow in the streams. The best time to go is after a rain when the stream start to drop and clear wether that’s now or January.
If the Fishing is pretty decent- the only thing you’ll need is a pink egg. You could get those online or any fly shops going to have those if you’re not tying.
I guess another thing is if the fishing tuff you could use small nymphs, like you would for trout and/or small eggs.
If you’re hard up to catch one, you could always put some skien on a hook and increase your odds
There are a number of fly/bait stores that will have everything you need. Poor Richards for example. I used to love the early season when it wasn’t cold like you’re talking about now, the problem is most of the fish are towards the mouths and that creates crowds.
I haven’t followed steel head really closely for a number of years but one thing you could do is look up uncle John’s campground they have a WebCam and you can look at the flows.
My other tip would be Fish during the week and not on the weekends when there’s significantly more crowding. Good luck.