I presume that you mean tournament packs.
If so they are random.
There are a variety of starter packs, depending on what you want to do you can choose from any of them. Green is a very popular one and a somewhat strong starter deck.
That depends on if the starter deck is sealed or not. If it is open, the cards and their condition.
The Wikipedia claims that the Black Lotus is the most valuable card ever.
There is no best they are all equal. I recommend the newest Intro/Starter pack you can find though, so it has the most up to date changes and rules.
A giant deck is a deck consisting of the creature type giant.
in the starter deck duelist box found local stores.
You can do a search at allmagiccards.com and essentialmagic.com
60-75 cards,
No starter deck or structure deck has every exodia card
wish counters make you pay a certain amount of mana to reaveal the top card off your deck you may then play that card without paying its mana cost.
You just need a good deck with flying and cards that give you life
The best place to make a deck online would be cockatrice.de because after you make a deck you can test for free.