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どこまで走れるか。
僕はずっと君の前に走る。
そして、ずっと守ってあげる。
約束だ！

Should work fine. Implies that a guy is saying it to his girlfriend or such, if it's between male friends, 君 is not recommended.

Well i can't read japanese script, so if you could write it in japanese so i can pronounce it will be great.

Despite my sometimes bad habits, I agree with Tobberoth (in various threads) that it's best to avoid romaji. So, what I'll do for you is put the sentences into phonetic Japanese (i.e. kana), with spaces between the words/particles.

どこまで走れるか。
どこ　まで　はしれる　か

僕はずっと君の前に走る。
ぼく　は　ずっと　きみ　の　まえ　に　はしる
[NB when used as a particle, は should be pronounced like わ]

そして、ずっと守ってあげる。
そして　ずっと　まもって　あげる

約束だ！
やくそく　だ

Thank you very much for the help!