But what is Bitcoins? from where to buy them to buy for this service? do you accept CC payment? PayPal?
Bitcoin - BTC - is an experimental, decentralized digital currency that enables instant payments to anyone, anywhere in the world. You can buy any bitcoin you want (or need) with your country fiat currency from the major bitcoin exchanges (see: Bitcoin Exchange Guide), at a physical dealer near you like the one on Localbitcoins.com or even here on bitcointak forum (Always use Escrows!).
You can use CC payments, fiat currencies, bank wires, etc - just any payment means you agree with your trading partner - but, You are better to avoid Paypal due to chargeback issues.