If you liked to play Miss Fortune you have to take Flash as the only way to escape in any dangerous situation. Ignite will be a good choice as the second skill because allow you kill enemy in 1vs1, even if you die (if used properly).
If you'd like to be more defensive you can choose Barrier or Heal that can help you in a lot of situation, it also help you if someone use Ignite on you.

Double Up is a good skill because you want to play aggressive on your line. At low level don't waste your mana to use it on minions, you just unnecessary push your line. If you can, try hit a minion before the enemy ad carry. Max it as soon as possible. As the second skill take Impure Shots and max in as the second skill. At level 4 take Make it Rain and then max it at the end. You can use it to reveal bush or slow enemy when they chase you.

more soon...