Making a Champ Pool

So I really need to narrow down my champion pool. I'm way too jumpy with who I play, constantly going back and forth between champs, I'm just not really that solid w/ many of them. So for starting a champ pool, how many champs should I look to have for each lane? I thought about doing no less than 3 and no more than 5. Also, I really want other people's opinions. Is it better to have meta picks, or picks you enjoy? Or a mix of both? Also, for each lane should I look for more diversity through who I pick, or keep them similar in their kits/roles/strengths and weaknesses as to learn better? Below I'll put some champs I've chosen for each role. Answers to any questions or just any feedback in general would be appreciated!

Top: Irelia, Renekton, Lissandra, Nidalee and Poppy Jung: Evelynn, Kha'Zix, Skarner,and Amumu (want to try Nid jung) Mid: Anivia, Yasuo, Nidalee, Cassiopeia, and Azir ADC: Ashe, Kalista, and Vayne Sup: Leona, Nami, and Sona