You can sell your products (could be anything) and services (art design, programming, etc) for bitcoin.
And you can join a sig campaign to earn some bitcoin while posting.
you are right if you have any skill you can sell it for bitcoins or product from your house sell it and buy some bitcoins as investment And you can join a sig campaign to earn some bitcoin while posting.
I think if you have knowledge about any computer language you can work here in services sections and earn some bitcoins then first make yourself skilled and then start working for bitcoins or you can choose another way of selling things in house