Moving between frames?

Hi there,

I have quite a large movie that I have built with 10 or so layers, that all live on frame one of the timeline, controlled by a single as3 file (of 700 or so lines) in my layer 'actions'.

It all works well but now I need to add a loading screen before the frame I have built, and another frame of more code in the middle of the two.

So essentially my 10 layer 1 frame effort that I have already needs to go last, and first i need a loading screen that upon loading goes to a new frame with a movie clip and as3, that when you click on the movie clip goes to the frame I have already built.

Sorry if thats a bit vague, i'm just wondering where I should start looking for tutorials help on performing such a process. ie frame 1: loading screen -> frame 2: a movie clip and as3 -> frame 3: more movie clips and as3...

Just wondering if im going about this the right way or if i've completely misunderstood the concept of frames, in which case how can i perform the type of three stage process i described.

Thanks very much for any help