bardzo prosze o sprawdzenie

Dear Mark

thank a lot for you letter. I am sorry J haven't written to you for such a long time. How are you? How are you doing at school? I hope you are ok. I experience a new girlfriend. I met you in the disco. In free time we went to the cinema, or restaurant and riding bicycles. We talking about school, concern, music and sports. I was really happy when I met you. I'll be really happy if you could come from Poland. I look forward to hearing from you .
Take care

Say hello to your girlfriend for me.

ThankS a lot for youR letter. I am sorry 'J' I haven't written to you for
such a long time.
I 'experience' (nie, - nie wiem co masz na mysli, zle napewno nie to slowo) a new girlfriend. (czy... I have met a new girlfriend)
I met 'you' (kogo masz na mysli - girlfriend- to wtedy HER) 'in' AT the disco. In free time we 'went' GO to the cinema, or A restaurant and riding bicycles.
We talK about school, 'concern' (cos to slowo tutaj dziwnie wyglada), music and sports. I was really happy when I met 'you' (you czy HER).
I'll be really happy if you could come 'from' TO Poland.