I rather use the built in multiplayer plugin
Good choice. But it is pretty advanced. There are a number of threads on multiplayer and syncing and messaging going on in the forum at the moment. Check my last couple posts.
I would recommend you do the tutorials by ashley and read the manual entry about 50 times.
After doing all that then you will be in the same boat as the rest of us... trying to figure it out and make it perform like we think it should. It is very advanced, and we have a lot of questions, and we all experimenting to what works best.
But check out the active multiplayer forum threads. Offer up your own tests, your own trials, your own breakthroughs and we will get to the end together