Get up to speed on terminology like RT (retweet), mention and hashtag.
Plan ahead: Schedule tweets on free programs like TweetDeck.
Make sure to respond to your RT's and mentions, to keep the conversation going.
Tag or mention (@) other pages when you're able to. It will increase the likelihood that they will like or reply to your tweet.
There are a lot of hashtags out there - keep yours consistent. Make a cheat sheet if you need to, and refer to all off JWU's popular hashtags.