I would very highly recommend that you get some time in boots and crampons Anurang and some instruction with using an ice axe for basic glacier travel. They will certainly cover some of the basics on the trip but I think it would give you a lot of confidence to have developed some of those skills before hand. The simplest way would be to just hire a guide for a couple of days of instruction that is tailored to your needs. If you just want to cover the basic snow/glacier travel skills I would actually wait until early spring when the snowpack is firmed up and more like it will be on Rainier. You could certainly do it over in the North Cascades or similar if you want. I can point you in the right direction if you need.