I would tell them to post quality and original content and to focus on the engagement with other Steemians. I would advise them to join some communities and make some friends. I would also tell them to focus on long term and don't get disappointed with the price of Steem at the moment as now is the ideal time to get visible as there are not many Steemians around.

Last but not least I would tell them to have fun! This is the most important!