Honestly I would try to avoid ranked until you're confident with at least every role, I made that mistake of ranking right when I hit 30 and I wasted so much time just plummeting straight down to Bronze 4 0 lp, and Jungling is a very solid role to main and also to some people's disbelief, bot lane is also a great place to main going into ranked. It's probably statistically proven somewhere that bot probably the place where most people end up feeding out of every lane, so with supports being so strong now laning wise, it's really easy to feed your adc everything they need to be the carry of the game.
Also I'd probably stick to playing the better champs in the meta if you want to climb higher then Bronze, I played Akali a majority of my games coming up from low Bronze and it worked, but as I got higher up I noticed that people actually knew what they were doing and playing soloq stompers like Akali and Yi are servery harder to play. But you should still stick with what you're conferrable with until you can make that change.
And @Tony, It is totally possible to carry 4 people who don't know what they're doing, you just need to be playing the right champs to do so, like you can't play teemo and expect to carry 4 people when you die instantly in teamfights. I've had to do it several times, some games I don't even pay attention to what my team is doing at a certain point and just focus on what plays I can make to swing the game in my team's favor.
And finally time for actual feel: tfw silver 2, i'm getting so close to gold ;w; hopefully season 4 dosen't start before i can actually get it