You're sure to have already picked up that my name is Garrett. Beyond that, I've been a big fan of tea for several years, but have just now begun to a develop a deeper, more refined appreciation for it. I'm so glad that I have come to realize and appreciate the intricacies that a fine tea can provide it's drinker, as I have vowed to never again succumb to the dreaded Lipton tea bags.

As I'm sure is the trend, my first post here is in search of advice, as I'm hoping to learn from your guys' experience and knowledge. It's probably worth mentioning that I have been looking through threads for several hours, so I am not coming to you without having done my due diligence.
I'm trying to determine what kind of teapot(s) would best suit my needs/drinking habits. Furthermore, recommendations of different teas would be very helpful. It appears that the tea samplers will be a very useful tool, and I plan on purchasing the Green, Oolong, and White ones from this site.
Here's what I'm working with so far:
This afternoon I came home with 1 lb. of Ten Ren's Pouchong 4th grade, in addition to 1lb. of their Dark Oolong 5th grade (split between myself and a roommate). In hindsight, perhaps a lesser quantity of some higher grade teas would have been better, but I figure that I'll be able make up for it.
I currently own two teapots: one made of porcelain that I picked up from Bed Bath & Beyond several years ago (roughly 40 oz.), and one made of Cast Iron with enamel coating on the inside (38 oz.).
It appears that many of you recommend the use of a Gaiwan when it comes to brewing several teas, which appeals to me because I am on a very strict budget (college student). Having said that, is my porcelain teapot just as capable, or would my tea benefit from the use of a Gaiwan? I'm also worried that my current teapots are too large to extract optimum flavor/aroma should I decide to only brew a half pot of tea. Am I correct in that assumption?
Oolong has thus far proved to be far and away my favorite tea, so I'm contemplating buying a clay pot (Yixing or otherwise) to dedicate to it. I'm just unsure if this is the best course of action, as I have read many posts that would seem to discredit the "one tea per pot" theory. I've also read that there are better materials to use with Oolong teas.
Sorry if this is long-winded. I've become very excited to learn as much as I can about tea, and I'm so happy that there are forums such as this to help me get started.
Thank you in advance for any advice, as it is greatly appreciated!

-Garrett