Welcoming new users for me the first thing is love, showing them love would come first, in various manner, steemit is a step by step development, and this should come first, when new users feels loved it uplifts their spirit, then secondly, the major steps in writing a post and generally acclamatising to the community is what I teach them.
Thirdly I tell them about the do's and don't's then it's also important to monitor their day to day activities also, and also importantly upvote them no matter how tiny the upvote may be.