Mwan3 setup for 2 wan

Hi everyone
I wanna use mwan3 on openwrt,for load balancing and integrate two internet connection.here my internet:

  1. wireless p2mp connection 30mbps 1500GB/year
    2)Dsl connection 8mbps 7500GB/year

How can i setup metric and weight for best performance and bandwidth,due internet traffic and speed.
And another question:
Both interface wizard and mwan3 wizard determine metric, please tell me about both of them...

Thanks for your help​:pray::heart::rose: