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One way of keep the wood from warping is to attach it to an aluminium frame of some kind. Alternatively, you could get the thicker, more robust version of MDF (at least 1 cm thick) and paint on that. If you want to keep the thin board, do a large cross in emulsion paint from corner to corner on the back, and be prepared to box-frame your piece at some stage.
Hanging MDF can be interesting, if you're using the slightly thicker type, you will be able to screw some some strong metal loops onto it to hang it from wall hooks.
The keep your paint on the surface, break the surfact slightly by sandpapering it gently. Use acryclic paint rather than oil. If your heart is set on using oils, then get a piece of unstretch canvas and use PVA glue to stretch it over and around your piece of MDF. If you don't have canvas, try using waste fabric - I have seen some interesting work done using old jeans and denim, and most people will be happy to give you their old torn jeans. You will need to put some size over the jeans if you want to use oil paints, but PVA will do the job.
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