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hi, why are you selling those domains, you can keep that earn from cash parking..there are good money in cash parking..

first of all you need to believe on yourself you can do it ..then you easily can do this.. then you can do this. find way of earning. start from fiverr and do reseller.
or start through cash...

without investing a penny you cant earn good money.. do freelancer, or start reseller or try fiverr.

yes social media is good traffic source. even google also love the social media, like facebook, pinterest have a good target traffic. ;)