US stations should be running FT8 in 'Contest Mode' with 'ARRL RTTY Roundup' selected in the Settings | Advanced tab of the software's set-up parameters. This will generate a signal report and a sequential serial number required for the contest exchange by DX stations and State by US stations.
Suggested frequencies? Who knows?
It might be helpful to clear (and save elsewhere!) your current log file from WSJT-X so that stations worked before, color coding, etc. are not influenced by stations you may have worked prior to the contest.