1. Get a GM Screen.
Don't want to spend any money on one with some sweet artwork? Fine - put together some simple word documents, print them out and use two manila storage folders (or some cardboard for the super-thrifty) to make your own. Not only will the quick reference material prove essential, but this keeps anyone with prying eyes (including those you most love and trust, apparently) from seeing the hit point totals of a creature or what an NPC's roll for a Bluff check was.
2. Keep a Running Cast List
Do you remember that surly bartender from the inn way back at 2nd level? I bet the PC he refused to serve does, and you don't want to give away any indication that you don't. Make a Running Cast List and every time you hand out a name, write it down (and include a short stat block or a note or two about what the NPC is about).
Nobody likes throwing out hours of design and development, but you have to remember that tabletop roleplaying is a collaborative engagement. If you wrote up a campaign for the great north, but they absolutely refuse to go there, then don't. Go ahead and provide incentive to steer them where you intended, but if they insist, make those obstacles into an adventure all their own until you can adapt what you've got or present something different for your players to sink their teeth into.
Everybody loves snacks.
I'm not saying that you have to game in a dark basement, but you should try to. Whenever possible, have some background music or sound effects playing. If they're in the swamp, get some chirping crickets, or if in a cathedral, get some chanting from somewhere. The effect this has on a group is readily apparent for something so easy to provide.
Even if you aren't any good at it, you should be doing this. You are the game world - bring it to life. If nothing else, it makes it easier for PCs to differentiate who's who in a multiple NPC conversation without breaking character and provides both the GM and the group a mnemonic device to remember that fictional individual.
7. The 2 Rule
This guy comes straight from the mouths of some of Paizo's very best. It's a general, situation-based bonus/penalty to ensure game fluidity. Find some reason for why the PC would have failed or succeeded on the check, then dole out those one or two integers to make the story move along. More details on that in the link above.
8. Play to the Entire Crowd
Obviously the party bard will take second seat in some combat situations, but that doesn't mean he shouldn't be busy. Make sure that your encounters are keeping the attention of all the players - if they aren't, include a lesser enemy to harry them and increase the drama. If their contributions aren't needed for victory, they aren't going to feel compelled to make them.
Don't stop doing them entirely, make sure to scale them (to a degree - some ambitious and overzealous goblins can be just that) and don't make them predictable or a constant occurrence. Not all of them need to be monsters either - earthquakes, hail and freak snowstorms happen.
10. Have Fun!
Make sure to enjoy yourself! Happiness and good times are contagious - if you're engaged, focused and excited, your players will be as well.
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