First ranked games?

I'm a very inexperienced player, and I've just started playing online 1v1s doing Malay elephant rushes and have had some success (2W,0L). This has given me a roughly 1100 ELO, and I feel like I'm going to be out of my depth soon. How is the matchmaking going to affect me after the next few games? And if I do find myself out matched once I'm out of my 10 "placement games," will I expect to fall down to a more expected rating? The ranked placement is very unclear, and I would love to know what to expect after the next few games. I feel like this strategy is not representative of my ability as I am able to end games at ~25 minutes but have no idea how to beat a player of this level if the rush is survived.

So basically, how long can I lean on a strong rush to carry me before I am forced to play more adaptively? And once I hit that point, what can I expect to happen when falling to a more appropriate ELO? I would also love to post recorded games to ask for advice on how to improve - how can I best post these without just recording the replay from my POV on YouTube?