Flash software cannot handle a big game, you have to split a game into many-many SWF files which are loading separately, it seems kinda difficult to me.
Welcome to the wonderful world of game development!

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No, unfortunately we don't support flash files. Currently we have support for some 3D formats for character models. We also support Spine animations. & we support both png & webp format images (I recommend webp for better optimization).
For scenes unfortunately you are going to have to setup a new scene per perspective view point. Videos would probably be the best option for creating the walking/rotation transitions between these different perspective view points.
Not much more I can offer really. If you want to check out scripting then look in the scripting section of the wiki. Also check out Simon's
Luadocs page.