Help with Star Wars Medley

I have written this star wars medley, I'll be happy if someone can help with the transitions between different parts (different pieces, next to the rehearsal marks).

https://musescore.com/user/31835879/scores/8162331?share=copy_lin

It might be better to move this to the "Incomplete works" section for more help.

All you've done so far is collect together the original melodies which are rather short for a medley. If you're happy with that, fine. But for a start you need to bring the last one, the repeat of the opening to some kind of cadence - the key chord (tonic, if you're ok with theory) - which seems to be G major. 

Do you intend to write an accompaniment? If you go orchestral you could be a bit more expansive about the melodies. As things are you'll run into one problem at least: you need to link the different tunes by way of bridge passages (which at a guess would take at least two bars, probably more to prepare for the next tune especially as it's in a different key). This would make these bridges quite long relative to your versions of the tunes.

Which brings me to: are you ok with copyright just copying the tunes as they are? I mean it could be ok (for Europe anyway) if a Medley can count as a parody. But be careful to check with the composer/publisher. They may give you permission with the right excuse: if you explained you're doing it as an amateur with no intention of public performance (yet).

So you have things to think about: Whether you intend to modulate during bridge passages to the new tune? You don't have to. but you still need some preparation.

What kind of accompaniment you want? Piano? String Quartet? Popular (rock-styled accompanying)? etc.

Copyright?