Tiffany,
When you say you can't get him to go to sleep, do you mean he stays awake playing in his room, or he cries until you come back into the room? If it's the crying that's happening, you'll need to let him cry it out. I know it's hard, I've been there, but I promise you, it works. And, it takes no time. If you start tonight, he'll be going to bed on his own by the end of the weekend. Here's how it works: put him to bed, normal time, say good night, love you, ect, and leave the room. Assure him you're just in the other room. If he starts to cry, leave anyways. If he's still crying after 5 minutes, go in there, lay him back down, do the same thing all over again (good night, love you, I'm in the livingroom) and leave again. This time, don't go back in for 10 minutes. Continue as long as you need to, but add 5 minutes to each time you go in there. Eventually, the kid will fall asleep, for exaustion, at least. Tomorrow, do the same thing, but you'll knowtice that it doesn't take as long as it did the first night. Each night will be easier until after only a few nights, he be going to sleep on his own. Like I said, I know it's hard to hear your baby crying in the other room, but it really works.
Good luck!
L.