Visualforce Question

Hey this is my first page in visual force the scenario is following :-

1. Create a VF page which can take parameter id of an user,
if no parameter is passed then it should take current logged in used id.

2 .Show all the accounts related to above user in drop down list (Label Accounts), Once the user select an account from drop down list, then show another drop down list (Label Notes) which should contain list of all the notes (Title) associated to that Account

3. Once user select notes record, it should display record values.

4. There should be edit button and once user clicks on edit, user should be able to edit it and save the same (this should happen only for records which are not private)

5. Edit button should not be displayed for Notes which are Private.

6. Place validations on drop down and record edit using apex page messages to show appropriate error and confirm message on successful edit.