Some of these are very risky like betting.
Some of them are waste of time like Faucet.
Mining?? Maybe it can be profitable if you are not paying a high electricity bill and that isn't the case for most of the countries.
Blog writing is good too since they can pay you. On the 4 that you said I think the last is the one that I will recommend for the newbies.

I earn my Bitcoins thru Signature campaign and trading it to gain more profit .