You can follow whoever you want, or no one. Ask isn't like Twitter, where you try to get lots of followers, it's about helping people by answering their questions as best you can. Most people here are nice, but like anywhere else, there are some who aren't. The moderators do a pretty good job of deleting questions and answers from people who are offensive or hurtful. Read through the Ask guidelines, so you'll know what's appropriate and what's not. :-)
Follow people who you want. Everyone is pretty nice (at least the people I have come across seem to be) Some of the basics are 1) be sure to answer with helpful answers and don't answer with idk or google it 2) click the helpful button if you think somebody is being helpful 3) only click the fun button if you click the helpful button 4) be respectful when answering 5) don't answer in text language 6) ask questions 7) don't beg for followers.
Well just be Respectful to Everyone, if you don't know an answer to a question then don't put "I don't know", only answer questions you know & be helpful & just be creative with answers & go beyond with it & make it your own but make sure it's correct of course, & follow anyone you might find helpful & just have fun, Ask is an Awesome Place! :)