Not to bust your balls but don't get toooo excited over ranked. I jumped straight into rank and got placed in b3 becuase I got rekt since I got put in positions i didn't play much. Needless to say I got to p5 last season but my advice is continuing practicing in normals in all positions. More than likely you will come across a game where you have to play jungle or adc or even support so be prepared.
2nd: if you do get placed in bronze or silver don't be discouraged. There is no such thing as "elo hell", all of LoL is hell actually, just understand this is where you learn to play champs as a team, ward more, control objectives, shoot for 10 CS a minute, etc..
As for the champs, ryze is a great top laner that is ment for late game. If you can survive his early game then you can rekt later. Blitz is more of a "troll" pick since other supports offer more in terms of protection for the adc. If you miss your hook your useless. Fizz is a great snow ball champ that if you get fed early can roam and dominate the game. Just remember to continuously CS, to many fizzes forget that detail.