Tsukahara the ac comprehensive guide will give you a really good foundation for using eddie in +r. Just ignore Puddle unblockables since puddle no longer hits low and it also wont teach you anything about weiss summon.
When trying to find tech with Weiss summon i came across this video on youtube
https://www.youtube.com/watch?v=TY8Rf_3xyDI
I can't seem to figure out how he is only hitting with the first hit of SG without frc. I am hoping someone could explain how he is doing this