League of Legends for dummies

Hello League Community I am hoping I can get some help from my fellow league players. Its been a while since I have had the drive that I currently do to really improve upon on my League of Legends skills. I feel if I were to rank myself currently i would be a low bronze ELO and I need help on improving which is why I took to these forums! My friends that I play with are quiet high skill levels all around high gold and I feel like a giant weight when i play with them and I would love to be able to improve quickly so i can catch up with them a little (I know how unrealistic it is to think i will be as good as them over night I understand how long it took them to get to that level). I have been playing this game on and off for about a year and a half and i have an understanding of how the game works what each role is trying to accomplish and I have a solid understanding of objectives and I know this will all come with experience, one piece of advise i would love to get is what champions people think I should practice with. One thing I would really like to improve is my laning phase and I would love to get some advice on champions that I should use because my problem currently is that I am having a hard time finding champions that i like to use and also have a high success rate with. If some people could give me some advice on champions to use in each lane that are relatively easy to learn and find success with so i can improve on my league skill without worry about learning a champ with a high skill kit.