Until you ask you will not know whether the person is interested in you or not. Therefore collect all your guts and follow the steps given below:
First step:
The foremost thing that you need to do is to introduce yourself to the person you are willing to date. Let him/her know that you are admiring them from a distance.
Second step:
Try to get the person’s mobile number directly or indirectly. If you prefer to get the number indirectly you will have to ask a common friend for the person’s number.
Third step:
What are you waiting for? Call the person. Select a time that is not disturbing. Do not listen to your friends and their advices and call on the time when you will feel comfortable to do so.
Fourth step:
When you call you will be required to reintroduce yourself. You can start your introduction like “Hey it is John. We had met at a friends place” or something like that.
Fifth step:
While you are speaking show some affection from your side and ask whether he/she would like to come along for a cup of coffee or something very similar that is very casual. In case the response is positive you can plan as to when, where and what time. If you get a negative reply, be polite take it as a hint that the person is not interested and get off the phone as soon as possible.
Sixth step:
If the reply was positive you can arrange for a casual meet for a small time that is half an hour. In case this works out great for you, you can then plan for a more formal date, may be for a lunch or dinner.
Seventh step:
Go for a formal date with the person you are interested in.