Check this guide to learn about WAN parameters https://www.seaart.ai/articleDetail/cvbpvb5e878c73esp4qg

If you want just 1 lora you can use this app https://www.seaart.ai/workFlowAppDetail/d03l9f5e878c73aaji5g

If you don't want to use lora select random lora and turn the switch "off"
To adjust video duration you can use multiples of 16

Example:

1 second= 16
2 seconds= 32
3 seconds= 48
4 seconds= 64
5 seconds= 80