Do you mean 'e-buy' as in the website or 'e-buy' as in you just want to buy something from a forum member?
1)Shipments depend on the location usually and the company used to ship(DHL etc.), and the weight and size of the package.
2)That also depends on the preffered shipping method(Same-day, 2-3day, and the standard which can be 4days-6weeks depending on location and company also.)
3)Most of the time it is the buyer sends money(If its a check it takes 2-3days normally to clear) western union/moneygram etc. then recieves their package. Unless you can find someone that allows installment payments, which I think would be rare.
A)That depends on the spinner, some people can spin with mega-light-short cord chucks, or long cords, or heavy chucks with long/short cord. Its all about your preference. Thats why I would work with DIY in a country that may have customs legalities for weapons etc. until you can find something more to your liking
then buy some based off of your preference.
Hope this helps Arturas

GL with getting your chucks buddy.