Welcome kmdean. You will find lots of help and knowledgeable people here. You will also find that what works for others may not work for you. The best you can do is listen to how others grow and decide what works for your orchids. They are your best guide.
1 & 4) I have a Phal. White Dream 'V3' that is in sphagnum moss and doing very well. I put a bamboo skewer (the kind you use for bbqs) in the pot and leave it there. I pull it out and check it for dampness. When it is almost dry, I water with half-strength fertilizer.
2) Typically north is the least favorable light. However, there are circumstances where it is fine. East is considered best, followed shaded south, then west. In northern US, you can use full south sun from October-February. If the leaves feel warm, there's too much light.
3. Don't trim the roots. Just let them be.
5. Wilted flowers stay wilted. You can snap them off and float them in a little bowl of water to keep enjoying them.
6. The flowers on mine lasted several months.
Here's the American Orchid Society culture sheet for Phals:
AOS | Phalaenopsis
Remember to take what it says with a grain of salt and whenever you have questions to post them here.
Good luck and welcome to this beautiful addiction.
kmdean 
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