You could start by looking at some of the many informative sites on snowboarding - there is a good one here, for instance - to get an idea of what you can expect, what equipment you will need and find some links to other useful sites. When you've got some information that way, if you type 'learn snowboarding videos' in a search engine you can find several instructional videos on YouTube and similar sites, to give you ideas about what the sport looks like and get a feel for how to start. All this should give you an idea of whether snowboarding is for you.

The next step is to book a few lessons at an organised venue such as this one - if you type in 'snowboarding lessons' plus your nearest city or region name, you should find a list of any winter sport centres in your area. If there are none, you may need to approach a travel agent to ask about your nearest winter sport resort.