Basically I'm repeating hte same thing, but oh well.
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1) Even at 14 my heal spells are interrupted...do I use points in holy first to minimize interruption?
If you think you need to. Those were the only two point in holy I've ever had, and I respecced out of them within a week, but I was at level cap at the time so didn't have many problems soloing. Ideally, your rogue will be taking all the hits, but Holy Focus is good in instances where tanking skills are, sadly, often lacking.
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2) Are shadow specced priests which I figure are good to solo, shunned in parties as you level?
Nope. You're always welcome as a healer, which (with decent gear) is fine until the level 70 instances. Even as shadow, one can probably heal heroics and a few/most Kara bosses if you've got very (very) good gear. Once you get higher levels - specifically, level 50+ for Vampiric Touch - you become much more viable/desirable as DPS as well.
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3) I thought a Priest was to heal
Nope, an all-too-common misconception. Most people go this route once they get higher level, but not all of us.
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why would anyone be Shadow post say 50?
To deal damage, and to solo well. Shadow can heal fine until at least level 70, as I said, and is by far the superior solo'ing spec.
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And are they again shunned in parties?
Nope, still welcome as a healer until level 70, and at that point definitely as DPS. A decently-geared shadow priest who knows what they're doing can put out some incredible damage, plus absolutely massive amounts of mana. They're everything but required for 25-man raids. For instance, the typical mana pool at level 70 is between 8000 and 10000, and on a typical raid boss, I return about 12000 mana to myself and 4 other people, while still maintaining damage enough to compete with warlocks and mages. Shadow priests also have the ability to boost shadow damage (warlocks) by a fair amount, and ALL spell damage by a lesser (but still significant) amount.
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4) If choose Shadow are heals/holy ganked....thinking when I chose Frost for Mage Fire spells still caused decent damage vs. told would be ganked.
Yea, you mean gimped :P
Nope, your heals won't be that gimped (of course they will be a little, but not enough to make a difference until really high levels). And actually, if you specced Frost, Fire spells were gimped a fair amount, whether or not you realized it (the biggest difference being Shatter), but these differences tend to show up most at higher levels with better gear and more talent investment.