Posting good and original content people would like and upvote
Upvoting articles that you like which are published by other members (just keep in mind that in this early stage you have only 10 upvotes available per day, if you don't want to drain your Voting power to the level of useless)
Posting meaningful comments on the articles other members published
And at the end you may buy STEEM (coin) on some coin market exchange and transfer it into your Steemit Wallet and by "PowerUp option" put them in your Steem Power wallet
There are many ways to do that...
Thanks for such a usefull and good information