Looping within an animation sequence in the Timeline:
place a "goToAndPlay()" script in the last frame of the sequence you want to loop, putting the frame number of the first frame of the loop between the empty parentheses.
Navigating from Scene to Scene:
At the end of the sequence you want to stay on (before jumping to the next sequence), select the Timeline track you have created for Actions, select the last frame of the sequence, and go to ACTIONS > GLOBAL FUNCTIONS > TIMELINE CONTROL > goToAndPlay(), putting the number of the first frame of the sequence in between the parentheses.
Then create a button that takes you to the first frame of the next sequence/movieclip:
Create the button, convert it to a button symbol, select it and go to the Action Script window and put:
on (release) {
goToAndPlay()
}
And type the number of the 1st frame of the next sequence into the parentheses.