The answer is, you don't. 30k Is actually best, and really only can be, played at higher point games. If you look at the cost of a 10 man squad...it's actually overpriced. Where you make up for those points is actually,and oddly enough, by adding more those units. It's actually cheaper points wise, and tactically, to expand your individual squads up. So 30k really lends itself to the bigger feel of nearly apocalypse sized games. Unless you're in a club where they do smaller ones...most places will usually do minimum of 2k points. I'm actually fairly sure it's what they even suggest in the books themselves.
Other than that...Word Bearers are geared heavily towards their Elites, more so than anyone else. They're solid(ish) and definitely worth their points. Even the Ashen Circle can be pretty devestating, 10 man jump pack guys...all equipped with flamers, and the Axe-rake is actually quite mean. The downside to Word Bearers is their lack heavy. Even in fluff they seemed to lack the vehicles and such of most armies...and their own Rite of War limits you to a single Heavy Support choice. Which means you'll have to really put a lot of thinking into which is going to be best for you. I honestly go with the Sicaran Battle Tank. It's twin Auto-cannons fire enough shots, and have high enough Str as to be a major threat to a lot of targets (and no jink saves against it!).
Add to the fact that you can field Daemon allies, means if necessary you can fill in where you're weak with Daemon allies. Again though...your strength is in your elites, and they are very very beautiful models to boot.