I would not suggest learning jungle, at least initially. You get more shit from your team than anyone(not fun for a newb I wouldn't think), and it will greatly hinder your ability to learn different champs and their cooldowns. You learn more laning against a champ once than you do five games playing against it while jungling. Additionally, jungle is in a shit place right now. You will be behind in exp, you will be behind in gold, and it's very easy if you don't know what you're doing to end up drastically behind the enemy solo laners and almost useless. My suggestion would be to pick one champ for each role(top, mid, adc, support) and try and make either top or mid someone who can also jungle in a pinch. Learn those champions in and out in normals. I would suggest making one of them Nasus, because he's cheap, he teaches you wave management(when playing Nasus you learn to last hit, keep the wave from pushing, keep it near your turret, etc), and if you don't know how to jungle and apply heavy map pressure playing Nasus in the jungle is super easy and in most lower level games you will get fed eventually because people have no clue how to end games.
Also, I would advise you to get the fuck out of bronze as quickly as possible, which means not doing ranked early and tanking your MMR. Yes, any good player can carry themselves out easily, but I've spent a lot of this season duoing with a Bronze 5(now Bronze 1 =D) RL friend, and I promise it will teach you bad habits. The players down there have worse attitudes, they give up more easily, and it's very easy to get cocky and just shit all over them due to them being bad, something that gives you positive reinforcement for doing stupid shit which will hurt you once you get to the middle ranks. I know for a fact my play has suffered on my main account at my real ELO because I'm so used to just steamrolling people in bronze while duoing with my buddy. In bronze they don't know that if I run at them with confidence and attack first they might be able to kill me, so I can run at three people and they all turn and run away. In gold they'll just kill you. So being mindlessly aggressive and developing those sorts of habits isn't a good thing.
Anyway, just my opinion. I think jungle is the hardest role to play correctly and the one where it is the hardest to find your leaks when you get into a negative play pattern.