I've worked from home for over 10 years, and love it. Things I have learned: (these may not be universally applicable, depending on what you do)
Just because I work from home doesn't mean I have to be at home. Some days I go to my favourite cafe and work. It's nice to have a change of scenery.
I don't like having the camera on for every meeting or call. Mostly it stays off. To make sure of this, if my laptop doesn't have a physical cover on the camera, I keep a post it note or some sticky tape over it. I use headphones via the USB slot; by keeping a USB adaptor in the slot without headphones plugged into it, I am secure that I cannot accidentally un-mute myself.
Electric throws, hot water bottles, and good slippers are your friends. So are winter base layers. I have fluffy leggings that keep me snuggly, and I wear trousers over them.
Make sure you schedule some breaks between calls/meetings so you can get a coffee/have a walk/use the loo.
Get the right technology. Invest in some really good headphones with a good microphone (either attached or separate). Crap ones can make your ears sore, and it's really irritating if people can't hear you properly. Consider if you need a stand-alone camera and a proper screen. Do a workplace H&S assessment (looking at posture, lighting, screen angles, etc) and ask for a proper desk chair if you don't have one already.
It is important to take time to chat to your colleagues and to get to know them. You'd do that if you were in the office. It's not wasted time - it's important to make sure you are still part of a team.
Decide how your boundaries are decided. Some jobs need contact 9-5 and then can be switched off. Some are more task-based, and mean you can take the afternoon off and make up the time in the evening. What ever yours is, make sure you manage those boundaries effectively and don't end up working 18 hour days.
Try all the advice. Personally I don't need to dress in office wear to feel professional - I can do that in PJs. I don't want to start my day with a walk, but I do like getting out in the sunshine at lunchtime. Not everyone is the same, but you won't know until you try.