I recommend you read through this article for some background info on becoming a Sommelier, and for some Resources you can use to get started.
Becoming a Certified Sommelier isn’t a tough process, it just takes time and commitment. If you take one of the Court of Master Sommelier training programs, you’ll need to do some offline training as there is a lot of “wine theory” you’ll need to learn and memorize – the principal wine producing areas of the world, grape varietal markers, wine service technique, etc.
If you go the self-taught route, I suggest you find other people training for the Sommelier exams in your area, it’s great to be able to pair up or learn as a group.
I strongly recommend you look into one of the more formal Sommelier training programs, like the one I took at the International Culinary Center in California (there’s one in New York, too). It’s expensive – you’ll end up parting with about $10K – but it’s the most fun & reliable way to earn your Certified Sommelier status.
I took their night class, meeting 3 times a week for 4+ hours a night over a 17 week period, plus a required field trip to a wine producer. You’ll taste 10 wines per session — that’s over 500 wines from all over the planet (everything from high-end Bordeaux to real funky stuff from China) over the 17 week session.
If you’d like to accelerate the learning and you can free up your daytime for day classes, they also have a 10-week session that meets 5 days a week, 4+ hours a day from 10AM to 2PM.
Either way, the commitment of 200+ hours of in-class time is just the start. You’ll need to put in at least another 5-10 hours of homework per week studying the course materials, preparing for exams, and expanding your wine tastings.
When you do the math of what it costs to buy 500+ wines from the key wine making regions, plus the time spent finding them, the cost of these intensive training programs is actually a good deal. Remember, you’ll be learning directly from Master Sommeliers PLUS learning from the palates of 19 other classmates. It’s great fun and well worth the time and money.
I hope that gets you started. Let me know if I can be of more help.