You need 3 things.
1) The ability to hold a beat.
2) The desire and motivation to get better.
3) Time to practice.
I was thrust into my role as a drummer when our drummer up and left. I was already coming to praise and worship rehearsals and sitting in for the drummer when he didn't show up. When he left the church I had to learn FAST. Fortunately I had the basic ability to hold a beat, and I VERY strong desire to get better.
I agree with BBD ONLY if you're playing the drums just to fill the need and not because you genuinely have a desire to be proficient on the instrument.
If you have a strong desire to learn how to play.......
You need to take a trip to your local Guitar Center/Sam Ash.
Purchase your own personal sticks and a Practice pad.
Practice drum rudiments constantly:
http://www.pas.org/Resources/rudiments/rudiments.htmlThere are several DVD's I can recommend, but as a beginner, this is one that helped me when I first started out:
http://www.samash.com/catalog/showitem.asp?ItemPos=6&TempID=7&STRID=154748&Method=2&CategoryID=0&BrandID=0&PriceRangeID=0&PageNum=0&DepartmentID=10&pagesize=10&SortMethod=4&SearchPhrase=snare+drum&Contains=%2Asnare%2A+AND+%2Adrum%2A&Search_Type=SEARCH&GroupCode=Practice those rudiments day and night man. It may seem like it's not doing anything, but they're necessary to helping you build control, speed and accuracy. Just make sure you practice as fast as you can ACCURATELY. That means that if you're practicing a rudiment and you're making too many mistakes, you're doing it too fast.
There are several people on this board who can help you out if you have any questions. Welcome to LGM
Remember: Even the Longest Journey begins with one step.