What type of TV is it (HD or SD) and what connections does it have?
If it is an SD TV, you will need the Composite and S-video adapter Apple sells for your MacBook. Then get a composite or S-video cable to connect it to your TV (S-video is higher quality than composite).
If it is a HD TV, you will need the mini-DVI to DVI adapter and then possibly a DVI to HDMI cable if the HD TV doesn't have a DVI port.