Potting an unknown orchid - suggestions ?

[Davesp310]

I'm after a little help with my first attempt at potting an orchid. What type of orchid ? I'm afraid I''m not sure

This one was lying in the bottom of my father's shadehouse, in amongst all the weeds, etc, but not in a pot. I'm assuming it fell out of its pot at some point and has been happily (or perhaps not so happily ??) lying on the ground ever since.

So, what do I need to do to get this into a pot ? What sort of potting mix would be suitable ? I assume I will need to "trim" or prune it a little ? Whereabouts ? It has a few new looking bulbs with leaves, a few green bulbs with no leaves, and a few dead, brown looking bulbs.