You have exactly two choices.
Your macbook has an 1/8" minijack output, you can use a standard 1/8" to RCA cable and run analog audio to the standard white/red inputs to your TV.
It also has a neat trick where they pack an optical audio output in there too, but with a weird connector. Go buy an TOSLINK Optical to "Apple optical" (I'm not sure what they call it) and you could run digital audio to your TV.
I'm assuming your TV has an optical input, it most certainly has the standard RCA plugs.
That is all the options