Questions-pc User Considering Ibook For Production, mbox/protools/logic queries... Options

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hi,
recently i have acquired an older model ibook (G3500, 12" scrn, 256ram) and am considering using this for production/beat-making instead of my pc...im thinking about getting an m-box - which would come w/ protools and i would get logic or nuendo as well...im wondering about the following: how will protools/logic run on this system? is the screen size a problem? is the m-box the best option for a sound card (within that price range and taking into account taht it comes w/ protools)? what other problems/issues should i consider?
any help is appreciated.
thanks in advance