Dual Wan - Load Balancing And Port Forwarding

Hello, I am new to the world of Fortinet.

I expose my situation.

I currently have a Fortigate 60E with FortiOS 56

I have two different internet connections from different ISPs.

Connection A: PPPOE - IP Static - 5 Mbps / 1 Mbps (WAN 1)

Connection B: DHCP - IP Static - 30 Mbps / 10 Mbps (WAN 2)

Each of the connections must respond to internal services. Example: Connection A (http 80 / https 443 / DVR 12358) Connection B (FTP 21 / FTP 22 /) The services differ this is only an example.

Here is what I would like:

I would like all communications from the internal to the external. Whether downloading or uploading goes through the WAN 2 at 100%.

I would like if the WAN1 or WAN2 falls that the internal traffic goes to the WAN remaining.

I would like the respective services to be accessible from external to internal on their respective WAN.

For now I tried to create an SD-WAN and create IPV4 rules with the SD-WAN as interface but the load balancing seems rather random and port forwarding does not work.

Which method would be best according to you?

Your help is greatly appreciated.