Question about collector configuration

Hi all, when tweaking the configuration file for collector, there ware some parameters that are not completely clear to us:
#1:
paths {
# “/com.acme/track” = “/com.snowplowanalytics.snowplow/tp2”
# “/com.acme/redirect” = “/r/tp2”
# “/com.acme/iglu” = “/com.snowplowanalytics.iglu/v1”
}
Are these something we absolutely have to have in production? Is there a more detailed description that explains what they do? Do we just replace acme with our domain?

#2:
policyRef = "/w3c/p3p.xml
Do we need to have an actual file for this somewhere?

#3:
cookie {
enabled = true
expiration = “365 days”
name = our-sp
domains = [
ourdomain.com” # e.g. “domain.com” -> any origin domain ending with this will be matched and domain.com will be returned
secure.ourdomain.com
]
domains += sp.ourdomain.com
fallbackDomain = “sp.ourdomain.com
secure = false
httpOnly = false
sameSite = “None”
}

How do we configure these and do we need to create any content for the subdomains or point the subdomains to anything?