you cant be banned for int feed if you are just playing bad. what you need to consider is not to play new champs in rank til you understand how to play them and the game. go to normals to learn new champs if you go into rank with a champ you dont know you might as well just ff @ 20 because chances are you are forcing your team to play a 4v5. you are setting your self up for failure. and ideally i would suggest dont play rank at all til you have 300 normal wins and 2 legit rune pages. dont have to be fancy with them these basic pages will work for all ad /ap champs.
AD: 9 flat ad reds/marks 9 flat armor yellows/seals 3 flat ad quints 9 flat magic resist blues AP: 9 flat magic pen reds/ 9 flat armor yellows/ 3 ap quints/ 9 flat mr blues with these two set ups your armor seals and mr blues only have to be bought once and can be used on both pages, then you just need the flat ad marks, flat ad quints flat magic pen marks and flat ap quints.
also dont play rank if you cant play at least 2 roles on a comfortable level. and say your main role is whatever you need to be able to play at least 2 champs on that role so you dont get banned or if you get a bad match up pick the better of the two champs. as your backup role similar situation. so lets say you are a "mid player" have your main mid laner and a back up and your secondary role be "support' and have 2 supports you can play ideally a poke/heal sustain support and a tanky cc engage support say something like 
or if your mid laner champ can be a secondary support like a 
