In reply to Littleslip: Hi there.
Yeah it's a big jump. Though as you say good thing you're not afraid of asking.
It's a big jump almost to the point the two activities are completely unrelated. Go climb a few mountains first to get some experience without even worrying about the climbing. There's a lot to consider and a lot of gear you need. Gear you'll need: stiff boots, waterproofs (trousers and jacket), gloves and maybe spares, axe, crampons, map and compass. I'm sure there's more. Learn the map and compass until you can do it without thinking. This can be practiced at/near home. Good to get it nailed before using it in extremis...
Also ask, can you place gear, set up belays, make a decent judgment of the avalanche hazard (SAIS.org.uk can help with this one). At this time of year the weather affects where the snow lies and how susceptible it is to avalanche.
So you can imagine it bears essentially no relation to the indoor wall. Remember that many winter routes are a 3000-foot-high walk with climbing in the middle so I'd suggest learn to get up and down mountains safely first.
Good luck