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Make sure before you start playing ranked games you know all lanes and know how to play multiple characters for each lane. By doing this you will avoid a lots of headaches by having others players complain about why you can only play one lane and/or with just one character.
Also, if you are listed 4th or 5th pick that does not mean you get to play what position you want, you fill. By doing this you better help the team composition and are working with the team opposed to against it.
The objective is to win and if you work with you team both in communication and planning then you are going to have a better chance at doing that.