How do you connect a condenser mic to a computer?

I’ve been playing music for a while (specifically acoustic guitar with vocals) and I want a small set up so I can start recording at home.

I’ve been looking at these 2 condenser mics http://www.amazon.com/MXL-Condenser-Microphone-Shock-Mount/dp/B0002GIRP2/ref=cm_cr_pr_pb_t

and http://www.amazon.com/Behringer-C-1-Studio-Condenser-Microphone/dp/B000CZ0RLK/ref=pd_cp_MI_2

but I have no idea how I would connect it to my computer!
I don’t really want to buy anything too expensive to do this either such as a mixer. Is there an adapter I could use? Also the first mic says it requires phantom power and I have no idea what that is! If it helps I have a Macbook Pro

Thanks