It's generally not always the wisest idea to up-vote to constantly- it'll reduce your weight for future votes. However, if you post a few times or rarely a day, than it's the least you can do to a thoughtful comment or faithful supporter of content. In my opinion anyway. And yes, you should always upvote your own posts, if you think it'll earn some money. Especially when your vote doesn't count for too much yet, as you'll count for MORE if someone agrees with you and likes your comment.

Check out some of my videos, if you'd like some more in depth analysis: https://steemit.com/steemit/@crypt0/the-inflation-rate-of-steemit-exposed

Cheers!