No, those sites are scams. They get you to spam the link to help advertise the site and bring in more suckers. Then when you've done enough spamming, they get you to fill out surveys before they send your reward - the surveys are how the site makes money, and they can never fully be completed. You'll do that work for them for no reward, they don't have anything to give you and don't need to either.
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Yes. You can get game cards from retailers, you can get gift codes for your friends, or you could make a ton of Minecraft accounts and a ton of email accounts and buy a paid membership for each.
They are codes used to create Webkinz Accounts.
You can buy minecraft gift codes, from the official minecraft website. The link can be found under "Sources and related links" below this answer. You need an account to buy gift codes. Though, creating an account is free.
You'd have to get it as a gift from someone else.
Making a leash in Minecraft MO Creatures is best done through trial and error. Short cuts or cheat codes are considered by consensus to be unethical and strongly discouraged.