For bios settings, you need to set PCIe Link Speed, Disable CSM Support, and usually need to enable Above 4G Decoding.
I used similar motherboards for mining because I kept them after repairing or upgrading old personal computers.
For mining you need 2 PCI-E x1 slots, but I don't know how this motherboard will work with new video cards.
I used the PX470 on similar motherboards.
First connect 1 video card, if everything is ok, then the second one.
These motherboards are old and unreliable, they broke in less than 1 year.