Load balancing 2 WAN connections into 1 LAN out

I have 2 WANs 1 is from PPPOE and the other from DHCP. I want to do load balancing on both. I will also have a third interface which is for LAN. The problem is when I setup these 2 WANs only one can ping to 8.8.8.8 from the ping utility while the other can’t ping past it’s gateway. If I remove the cable for one the other ping properly. So I wanna do load balancing on these 2 connections to get faster downloads on protocols that allow it and on softwares like IDM and steam. So I was wondering what I need to do. I’m totally new to this. Only thing i worked with was pfsense.

Regards

At least 10 topics on this forum during past half a year deal with this same scenario. Check this nice article.