i read on satoshi btc client that the transaction to send btc can be done faster in blockchain for a small fee but i don't understand well the exact fee to pay for every transaction
is it 0.010000 btc?
If you are referring how long it takes for a transaction to confirm, what that means is that the transaction gets included in a block and once that happens then it will confirm after a total of 6 confirmations (for most services, such as exchanges).
So you are likely concerned with how long before a payment makes it into that first block. Inclusion in a block, regardless of fee, can be something that takes any where from under a minute to over an hour even if no miners have solved a block. When the fee is insufficient, that can take even longer -- up to a day at current levels when there was no fee paid at all, though even those are unlikely to take that long.
A transaction with a fee (e..g, 0.0005 BTC) may be included in a block faster than a transaction with no fee paid, in some instances.
A larger fee doesn't necessarily guarantee any faster inclusion.
So a 0.0005 BTC fee will generally be sufficient to get your payment included promptly in the next block in most instances.
Now if you are sending low priority transactions (e.g., small amounts, like 0.02 BTC) or the client chooses many tiny amounts that you've received to make up your transaction (which would occur if you receive tiny payouts from a mining pool or SatoshiDICE payouts) then a larger fee may be necessary.
The client will tell you the amount you would need to pay if it is more than 0.0005 BTC.
If instant confirmations are useful, there are several options. Funds for redeemable codes are settled immediately once the code is claimed. These codes are available in either USD or BTC currency denominations. If the recipient accepts green transactions for immediate credit, some services (e.g., Mt. Gox) allow withdrawals using the Green Transaction option.
If the recipient trusts the sender or if the purchase is a trivial amount, the recipient might offer to treat the transaction as payment received on 0/unconfirmed. This is recognized just a few seconds after payment is sent.
tl;dr: The fee is 0.0005 is sufficient unless you are sending spam-like transactions or have received spam-like transactions. When that happens, the client knows how to handle it.