you mean how to say "You could have at least said bye" in Turkish? Well you can say "En azından bir hoşçakal diyebilirdin." Here, bye means "hoşçakal" but you can use "güle güle" or "bay bay" too. I hope it will help :) edit: i've read it as there was "at least" it doesn't change, in fact.

I think, talking is the best choice. It doesn't matter if you are good or not in talking but I'm sure it makes you used to that language. My English improved with talking in English with other people :)

Well, there's also writing option. It would be fun to write an English diary, but i suppose you can find people on the net then you can chat in English. That makes a little easier, because if you start to write a diary, it would be private so no one would dare to read it. So how can you find your mistakes. But it has a great option, that, you can see your improvements with writing a diary. You even would notice your mistakes in the old pages.

btw, repeating sentences from a movie seems good. it's smillar to talking with someone, it would make your pronounciation better. but if you want to read something out loud, you should try to read some story books on your level.

i hope this would help to you :)

Well I have a few~~
My favorite anime
*GinTama
*Durarara!!
*Trigun
[Well I mostly read manga .-.]

and about my favorite characters:
*Sakata Gintoki
*Bouya Harumichi
*Portgas D. Ace
*Shinagawa Daichi
*Edward Elric
...