they're supposed to be 20c each
The same price as before.
It depends on the rarity of the cards: For example: The rarest pokemon card (prerelease raichu) was recently sold for $10,000. On average, however, the answer is $300 (with the average price being 15 cents) If you have a lot of common cards my guess would be about 100$, but you should check on some websites and check the real price of the card.
yes you should then when your older sell all your cards for twice as much money as you payed
It depends what the Pokemon cards are.
U SHOULD SPEND NOT SO MUCH AND LOOK LIKE A POKEMON FREAK BUT SPEND JUST ENOUGH SO THAT IF SOMEONE TALKS 2 MUCH, JUST SHOVE IT IN THEIR MOUTHS
Go to your local Toys 'R' Us or news stand and get a Pokemon card price guide magazine and look up your cards. Make sure you're not selling something for $1.00 that's worth a lot more.
About 6,000 English cards
Depends on which cards. :)
ten cards
Energy cards are usually included in almost every pack you get (at least the ones I get. That's a lot of packs!), so you shouldn't worry about getting energy cards as much as you should about where to get packs of Pokemon cards in general.
5-9 Pokemon cards and 9 dollars
Depends what cards you have.