A special guest always helps
You could cultivate a solid club night around a core set of residents (ie. your friends) but this takes time and patience. If you're interested in booking talent because you'd rather see your favourite DJ at your own party rather than some skanky big venue, then go for it. Special guests will help bring attention and people to your night. But be careful: try to go for artists who don't normally play your town or artists who you know people are definitely hyped about seeing. And you'll have to make sure you've got the green to afford their booking fee. If you get nervous about shelling out, just remember one thing: if you book them, they will come.
Get an afterparty destination sorted
Your function has just gone off. Everyone's played a blinder and your crowd has danced so hard that their clothes have gone see-through with sweat. But the lights are on and the bouncers are being dicks, booting your entourage out the door into the cold, hard dawn. Where next? Avoid a lot of wavey awkwardness by having an afterparty destination locked and loaded. Take your squad back to yours where a fridge full of bevs and a decent stereo lie in wait. Perfect.