for tips on control etc?
Mostly, ensure everything is smooth. Use the engine for accelerating and braking as much as you can as that'll smooth things out. If you're still on a 125 this may be trickier but is still possible. If your bike is jerky on and off the throttle, use plenty of clutch to smooth this out.
Watch out for snow dumped off the back of cars because the drivers are selfish c**ts.
Watch out for grit where the gritter gets stopped, such as on the approach / entry to roundabouts, junctions, in the middle of the road.... anywhere really.
This isn't the time for full throttle and riding a motorcycle in winter is barely any fun.
Get a brighter headlamp and ideally a louder horn. Stebel Magnums are good. Nautilus is amazing. People will not see you. People are stupid. People are also arseholes who will see you and do the stupid, c**tish thing anyway. FUCKERS!
Make sure your tyre pressures are correct. They'll drop as will your ability to control the bike as the temperature drops.
If it's icy then you have a couple of options - if it's patchy ice that you can see, you should be okay. If it's black ice and there could be sheets of the stuff then just don't bother.
Good control means you have to keep your hands warm. You'd be amazed at how good muffs are for keeping your hands warm. However, when you're on the bike handlebar muffs are what you want - it's a pain positioning them so they don't get in the way of things but when they're on, they're brilliant. You can usually get away with gloves that are suitable in autumn time when it's well into minus figures outside.
If your road isn't gritted, get yourself a bag of grit and if it getse really icy or snowy, put down a nice 6" thick line from your house to the end of the road, if possible. You may have to mark it so you don't miss it. I recommend using markers made out of toilet roll, soaked in meth or some other flammable shit and set alight. Takes a while to get going but you'll feel like a proper stunt rider going through them. Note, put something underneath them or you'll get done for the cost of resurfacing the road...
If you can get a visor insert like a pinlock, get it. Otherwise anti fog wipes are good.
Get a clean cloth that you can use on your visor - be careful though as the salt shit can get on the visor and really scratch it if you rub hard. Fantastic for when the greasy shit gets thrown up and you've got a minute at traffic lights. Either mount a pouch on your handlebars for this, use a tank bag with small pockets or find a hivi of some kind with pockets.
Oh and you know those things used by fire eaters that don't seem to go out? Get those and stick em on the bar end weights. You'll get noticed when people see fire coming towards them.