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First, do I have to make all editts in the world editor and in sequential order?
Every change you apply will change roughly the whole span between 2 closest keyframes for that parameters (can be more depending on what you are doing), because chaotica interpolates between created keyframes - so whatever you do between 2 existing keyframes will affect the interpolations and, as result, all the frames.
So, for example, if you set a keyframe for a value x=0.1 at frame 100, and another one for x=0.5 at frame 200, and then go to frame 150 and change x, all span between 100 and 200 will be affected.
1. keyframes are set individually for each edited parameter (for example, if you edit the weights, it will not set a keyframe for shaders, only for weights)
2. the order you implement the changes does not matter. If in the example above you first edit at frame 200, then 150, then 100, or first 100, then 150, then 200, the result will be the same.
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is it possible to use the animation tool to morph one world into another by selecting the second wormd from the radomly generated thumbnails
No, it is not possible.
Although morphing worlds is doable, it is not trivial and imho you shouldn´t worry with it right now, but rather just learn the software mechanics, weights, transformations, etc.