Multiwan and how to make base routing policies with the router's own traffic

[Abelardo A.M.]

Hello,
I've been looking for an answer to the following situation for a few days but I can't find the answer.

I have a multiwan design. The pfsense itself acts as a proxy and VPN. I have managed to balance the email traffic coming from the LAN. The questions are:
How can I balance the traffic that leaves the pfsense proxy itself?
How can I make the VPN connections leave through the WAN through which they enter?
And if the VPN service uses the WAN interface that is not the default gateway, how do I ensure that traffic enters and leaves through this WAN and not through the default gateway?

Thank you for the answer.