There are lots of ways to earn bitcoin.

- Offer your skills in services section like making a logo, signature or avatar this is mostly offered from services section.
- Join in signature and avatar campaign and bounties
- You can also get a job in https://www.xbtfreelancer.com/ and paid with bitcoin.
- You can also earn bitcoin by solving captcha from faucet websites to get rewards.
- You can also earn bitcoin on CPA like ogads they are paying in bitcoin but you must learn how to spam on instagram or know how to do SEO.

What kind of job you are looking for? There are some places where you can be hired for a job and earn bitcoins.
If you know about CPA marketing you can earn bitcoins by promoting some offers and get leads.

Another source is captcha typing there are some company that offers captcha solving and they will pay in bitcoin.

Mining is a good investment if you know what hardware you should buy but if you don't know which hardware is profitable then you can check this https://www.asicminervalue.com/ and you will find which ASICminer is the best to make you profit today.

This is only good for those people who can hold coins for a long time and sell them at the right time. Same as GPU mining but if you are making a profit in ASICminer you can sell your coins without waiting in the right time.

Coinbadse, coinmama and Cex.io allow you to buy using credit cards. Coinbase is one of the biggest exchanges in the world

The fee to use credit card is higher, ahout3-5%....
If it is the only way for you, go ahead, but I would suggest that you try another payment method.