I don't know any thing about bit coin , what I know that it digital currency maintained by people and not banks.
How do I start earning my bitcoins ? OK After earning this bitcoins ? What all things I can buy in real world or it just to pay for only services to service provider?
HOW TO BUY BITCOINS
1) From exchanges. Exchanges are many based on countries. UNOCOIN is a popular one for India. Alternatively, if your nationality is different from what I presumed, you can have a look at this site for many exchanges and wallets: COINDESK. You can create a bitcoin wallet here: BLOCKCHAIN
2) Have a look at this link for more detailed explanation: How do you obtain bitcoins?
WHERE CAN I SPEND THEM
You can spend them on websites/services which ACCEPT bitcoins as a mode of payment just like Paypal, Credit Card or Debit Card.
As a supplement to the buying process provided by @trollster -
If you would like to earn bitcoin (rather than paying for them directly) there are a few ways to do so. Mining is one example, but it requires purchasing specialized equipment and will likely entail a good deal of research as well. You might choose to sell goods or services in exchange for bitcoin.
A more simple and practical way to earn small amounts of bitcoin is by completing tasks or surveys online. There is an array of websites that offer this form of compensation - which will vary in terms of compensation level, accessibility, reputation, and reliability. From my own experience, I can attest to the fact that www.BitcoinGet.com did pay out (which was my biggest concern). Earning a full bitcoin through this medium alone would take quite a bit of time - but is the only option I can recommend that requires zero capital.
If you do want to earn some bitcoin in that manner, you should still create a bitcoin wallet and an address by following step 1 from @trollster
Welcome to Bitcoin!
