I can suggest that you check out the following:

http://www.witnesspage.com/

as a starting point, then follow:

https://steemit.com/@witnesspage

where all the posts made by Steem Witnesses using the relevant tags #witness, #witness-category or #witness-update

So you can get in your feed the posts from our witnesses.

As for voting, it is a personal choice and there is absolutely nothing wrong with changing your votes as you go along through your Steemian experience.

I hope this helps.