I've been involved in sports my whole life, previously professionally, now amateurishly with various sports, so fitness is not a problem. In 2008 I also started mountaineering and it hooked me. I started with tours like Mangart (Slovenian, Italian), Jalovec, Triglav (via Plamenice), Skuta... in short, all very demanding ones, because I wanted to find out if I'm cut out for it or not. I also walk easier paths and enjoy them, no mistake, but I have time for those in later years. Last year I attended an alpinism course and I must say it wasn't in vain. You learn a lot and also realize that the mountain in winter is something completely different from summer, when you go along the ridge without worry because there's a path, in winter those paths mostly aren't there, but a smooth snowy slide. If you slip there....
Anyway, this year I also planned to go to the mountains in winter and I admit I don't have much experience with winter ascents, but I couldn't find a partner for some winter climb (time coordination). So I plan to go, when conditions allow, to Stenar, because I saw pictures of winter ascent and it excited me. I would also climb Triglav, but only with an alpinist escort, because the ascent to Mali Triglav seems quite demanding to me. Anyway, the alpinism school will be very useful to you, as you will learn a lot about conditions as well as proper use of equipment (knots, self-belaying, movement on terrain...). I hope you got some information from the "less experienced".