There are some handy oven to air fryer conversion charts around that help when you'd rather not guess times or temperatures (and only have conventional oven instructions on your packaging). I have saved one to my phone for use in our kitchen - I think it was originally a tea towel or a place mat or something along those lines.
I found plenty of web sites with conversion charts as well like this one -
https://lianaskitchen.co.uk/oven-to-...er-conversion/ - which seems fairly straightforward and much the same as the one I use. There seem to be a few around if you don't get on with that site.
I also found it helpful to get silicon liners for the drawers on ours - saves on washing up.
If you're after specific Christmas dinner tips there was quite a good documentary by Alexis Conrad the other day on Channel 5 -
https://www.channel5.com/show/air-fr...tmas-made-easy
PS - I find it better to err on the low side for cooking times and temperatures. You can always put your food in for a few more minutes if not fully cooked but you can't un-burn it if you over-cook it.