If you really like watches, you'll learn along the way, most probably you will self educate yourself thru forum and google.
You'll started to know what is a dive watch, gmt, perpertual calander, anual calendar, automatic, chronograph, power reserve, minute repeater, how many VPH, bezel and the list goes on...
I don't know any formula or procedure to make yourself getting interested in watches, I syiok sendiri and learn along the way.
If you just looking to buy a watch for your wife, then any sales representative in any watch dealer can help you to decide based on your budget.
Stick around here long enough, self enlightenment can be achieved.