I tried to translate your sentence into a English sentence and I think you are asking this? (Rough Google Translate translation)
"Can we not start this game for trail purposes?"
Answer 1: If you are looking for a trail key I would redirect you to the "Trail Key Thread"
Answer 2: Yes you are able to play this game for a trail period, that will last 7 days
Answer 3: You are not able to redeem multiple keys on one character, so you can only redeem one.
Hopefully this answers your question, otherwise I will see if I can reach out to a Turkish MOD.