[REQUEST] I have a question

[MiiRaGo]

Hello guys I don`t know if I am here in the right thread but I need help.

I want to start with pokemon competitive but I don`t really know how to start :/

I want to build a team around mega Mawile but I don`t really get the points synergy etc. :/ Hope you can help me and give me some advices for a team