I'm a synchro skater myself, and would like to give you the perspective from a potential teammate.
Synchro is awesome and a great way to improve your skating and have a great time. I highly recommend.
Having said that, do yourself, and your future teammates a favor and take the time you need to acquire the skills and master them to an appropriate level. There's a lot to learn about skating in formations- how to support yourself, your neighbors, regulate your speed, how to hold on, and how to help maintain the line. It's not as evident as you might think, and you really do need to be solid. Furthermore, you have to be able to match your technique to the other skaters as well, in terms of timing and maintaining the correct direction of travel. So you do need to have the basics pretty well mastered. At 16, if you go straight to a competing team, it'll either be Jr or Mixed Age. Mixed age can also require a pretty high level of skating. So much will be expected of you as a team member. If you're starting on a learning team (many rinks have these, to get skaters ready for the competitive teams) the pressure will be lower, but you'll certainly want to advance quickly to get to the competitive team.
It is frustrating enough being the new person and learning all of the above, when it seems like everyone else knows it already (don't worry they're all still learning too). You don't want to be doing all that, while at the same time be shaky on the basic L1 and L2 skills. Your teammates will not appreciate it if you're not at the right level. You don't want that stress.
If you can swing it, I would get some private lessons- you'll save money and time in the long run, because you'll pass your skills faster, and be more confident that when you do have the level to join the team, your skills are right where they should be and you can have FUN!
You have LOTS of time ahead of you!!! Don't rush it and enjoy every minute of learning these skills. Synchro will be there when you're ready.