1. Alpine touriing and randonee are the same thing. Yes. Above all, don't start off telemarking, unless you're a masochist. And this is coming from a telemarker of about 35 years, well, one who's been trying that long anyway.
2. Develop your ski skills first. Until then you'll be a liability to your partners, or yourself, in the backcountry. Yes, lessons are an excellent start, but developing your skills will be more a function of TIME ON THE SNOW. Wherever you go, get a season pass, and use it, not just both weekend days but during the week (night skiing) too. Get a pass at the hill that will benefit you the most, whether it be where buddies go, there's night skiing, or terrain that will not just allow, but force you, to improve.
3. For BC touring, the lightest Dynafit setup possible. But for inbounds, you may want a regular alpine set-up that's appropriate--depends on your financial situation of course. I know many others here are better versed than I on AT, and downhill, equipment.
If you're fairly athletic, get in many days during your first season (30-50?), you could conceivably be ready in the spring for backcountry, harvestable corn snow such as we have now. Skiing powder is a whole different story, and typically takes longer to learn--you'll want to develop your powder skills by skiing the off-piste inbounds first, and I wouldn't expect you to be able to ski BC powder until at least your second year, even with many days on the snow up to then.
Lastly, and most important, you need to develop your own knowledge for the BC, where it's all about avoiding avalanches. Head into the BC with knowledgeable partners, who know where to go, and how to avoid avalanche danger, or, if God forbids it ever happens to you, know what to do if you do get in an avalanche. You can get only so much by reading. By learning from others and actually experiencing it at the same time will you learn the most. So, for that matter, you'll at least want to take a Level I course early on.
No hating, there's plenty of love to go around in the BC. Have fun and good luck.