How can i be talktive (i m stranger to my colleagues)?

Ok now as my nature i am ver silent person. i don't socialize much and don't have much to talk expecr for what i have done, what i do or what i like to watch. its been a month in my new office. and i see people talking and chatting with each other and i am just silent sitting idle.even in my relationship i don't know what to talk and i talk rubbish of here and there. i wanna be one of that person who get conversation starte. who get people interest and people miss him when he is not around and something is wrong with him. what should i do?