Most religious orders have a website where you can find out about their way of life and the work they do. As you read about the different orders in all likelihood you will feel attracted to some more than others. This is an indication of where you might explore further.
If the sense of call continues and you feel you should follow it consider talking to a vocations director. He will help you recognise whether or not a particular order would be the best one for you.
Above all be patient! Be patient with yourself! Recognizing or discerning a vocation is a gentle and gradual process and can take quite a bit of time.
It is good to talk about the sense of call you feel. Talk to someone you trust – a family member or friend.
If you know a priest or religious you might consider sharing your thoughts with them.