What are you comfortable with? If you like rocking him to sleep, do so. If not, transition him from rocking to letting him sooth himself to sleep. My son would only sleep in his bouncy seat for about 2 weeks straight, and I let him. You baby knows what he needs and as a mom, no one will know your baby like you do. Trust in youself and trust your instincts. You will know when the time is right to give him room to become more independent or to keep him close. Go with the flow, there is no rush. I know that you have probably heard his about a thousand times now,(and you'll hear it about a billion more times) but, you'll miss these days. Appreciate what you have now, and trust me, the sleep will come in time. Also, try a swing. It might help.
Having a consistent bedtime routine worked best for us. We read 2 short stories, sang a song, turned on her mobile and then put her in bed. The same thing at the same time every night. After awhile, she didn't even fuss, just rolled over and went to sleep, because she knew it was bedtime. Whatever you decide to do, make sure its something you want to continue for a long time, because he'll learn to expect it.