Talk nicely about stuff to help cement the friendship, watch the movie together during which time take note of how she positions herself etc. beside you, if it looks like she would enjoy you being nearer to her then gently hold your hand over her own, holding your arm around her if she takes the hand holding very well. Enjoy the duration of the movie and then talk some more when it is over and if she has warmed up to you well then smile warmly at her to check if she responds, if she does then try to go in for a kiss. Whether you do kiss or choose not to still make sure to ask when she is next available to meet for a meal or movie etc. again, if she does like you enough then she will likely either give a time or at least show interest with thinking about it. Sharing mobile numbers or email / skype or AIM etc. then would be a good way to keep in touch.
Obviously the key thing is to not go too fast, but at the same time don't go too slow, while you are with her you should be able to sense her anxiety or openness to you as the date goes on and can take actions depending on it.