How many of you use rain gear and/or mudguards on your road bikes (if they have that option)

Besides going full out on rain/waterproof gear and mudguards, what would you rate as most important?

waterproof top?
gloves?
shoe cover?
mudguard?
waterproof shorts?
helmet cover OR a shower cap under helmet?

I've read waterproof items are great at keeping water out but also great at making you sweat with no way of venting the 'hot air', some suggest Neoprene is another option...

I'm asking for opinions because I'm new to riding and don't have any of the above, all my cycling clothing are daytime dry and some reflective night time dry riding.
At most, I'm only planning to ride 1-2hrs in rain....and only light-ish rain, not thunderstorm downpours

I had a quick look at reviews etc, theres so many available but at $$$