User blog comment:KaiserLos24/Champions for Pre-30 Summoners/@comment-6301973-20140312184546

until level 20, don't buy runes. i tell that to everyone who is starting out. you don't need one of each low tier runes. also remember, pre-30's don't have a few summoner spells like flash.

Leona: she has a great engadge, can get out of bad situations, and is tanky enough that making a small mistake might not cost you. Caitlin: she has a ranged kit making her useful without making you get in the face of the enemies. has a wonderful escape. build life steel. Teemo: a little tricky to know when to use the blind, but other wise he is fun and has a run fast. just rememeber to lead them to your shrooms. Zilean: talk about a forgiving. you get an ult to revive you (or another pre-30 friend!) and his bombs are long range. Amumu: nothing tricky about him. just be careful about who you hit with that bandage. and try to get as many people in the ult as possible. Ashe: no escape, but the slows can make up for that. she is very spell dependant (thus, needs mana) but that ult is a ranged dis/engage. Garen: No cost for spell means you are not having to lean mana management. he can be quite the bully in lane. no real "tricks" to using him, which also makes him not so good against skilled players.

those are just a few to start off with. none of this matters unless you are trying to get a grasp of the game. it has the complexity of an rts and there are ~120 champs to learn not to mention how they change their style with different builds. over all, i would recommend learning all the champs when you can (i have been playing for 4 years and still have a few to go learn), but try to learn one champ really well while leveling up.