craftgrrl | questions about selling online

[if this is inappropriate, feel free to delete]

hey all!
i want to open a store on etsy.com, but i'm a bit unsure about calculating shipping prices. i was just wondering, for any of you who sell online, do you use ups or fedex? [i've heard warnings against certain shipping companies] or do you just use regular post? which you think is the best? i've been to the ups site, and in order to calculate shipping costs, it requires the postal code of where the package is going, but i just want a general idea of how much it'll cost to ship within canada, or to the states.

also, i just got a paypal account, and i was wondering for sellers, which one do you prefer? personal or premier/business account?

thank you so much for any advice!