Mikrotik's configuration cannot be used as any other commercial router, due to its configuration and abilities.
In your case make a drawing with the simplest network diagram that you have i mind and and how to access the Internet. Once you got that, then start thinking what else you need, features perspective, in your network, so you can start adding things up.
Seeing from your post that you simply need to have a few clients accessing the Internet. What about the Internet connection.
- Will you use pppoe on the Mikrotik or static IP to access the Internet?
Tell us a few things how you connect
- Will you have a dhcp server to send the IPs or will you have static IPs
I could help you with a basic config to start with, once i have the basic's of your network, especially connectivity to the Internet.
Personally, i would
NOT go to any app to configure the Mikrotik, as you will not get the idea how thinks work and what to do next. I use the app to mainly monitor things.
Let's begin with the basic config and then you can get a grip to start learning the rest.