If you're going to be using MikroTik routers in your job, then it would definitely be worth it to do the basic training course with a certified MikroTik trainer.
I've done the basic training a few months ago, and with me was another guy who wanted to run his own Wireless ISP. He printed out basically all the Wiki pages and tried to teach himself, but he still couldn't manage to get his ISP running like it should. After the basic training he was able to sort out all the basics network configurations.
Of course if you already have lots of network knowledge, but not MikroTik specific know-how then the wiki pages might suffice.