Not having the warclaw sucks! You can't keep up with the group and if you do arrive while there's fighting, its usually right when a fight has nearly ended. And getting left behind makes you easy prey for every mounted enemy on the map.
To anyone new to wvw all I can say is: don't give up, keep chasing the zerg, your persistence and patience will pay off. You are paying your dues.
I played a f-ton of wvw this weekend and got everything I needed for the warclaw. Buy PoF (its on sale and you get HoT free now!), put a point in the warclaw wvw mastery, select the warclaw reward track, and be persistent. Every thing just comes down to time played + persistence + patience.
Make sure you touch every guild buff, chow down some xp food and use those xp boosters that Anet gives out all the time. If you've been smart you've been saving those "useless" wvw ones for days like these. And then... join a map. Doesn't really matter which one. Don't see any commanders to tag up and join squad on one map, switch to a different map (use the waypoint) and then another, etc... Ask in /team and /map if there is a squad to join and where everyone is headed. Ask for a discord link (even if you can't talk, you can listen) .Let them know you're new. Once you get in a group, get your cardio on! Do that marathon run from the waypoint to where ever the zerg seems to be going. As long as you're active in some small way you're going to get reward track xp and even when you're late, your often getting credit and loot.
And eventually, you'll get your warclaw.