From July

From July I will be in the United States. I'm some nervous because [IT] is going to be a new experience to FOR me and in the same time I'm nervous too because I dont know well english WELL and it can be a problem. I need to learn more english because obviosly that's the language in which they will speak to me all the time there. I'm not going to ON vacation, I'm going to work and make money.I hope I can learn more. I think my enlish is very bad. So thank you fot correct FOR CORRECTING this.

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Not bad! I am sure it will work out. Be sure to get as much LISTENING practice as you can now; I think most people have a harder time understaning Americans than speaking to them! :)

From As of July

From As of July I will be in the United States. I'm somewhat nervous because it is going to be a new experience to for me and in at the same time I'm nervous too because I don't know well English well and it can be a problem. I need to learn more English because obviously that's the language in which they will speak to me all the time there. I'm not going to on vacation, I'm going to work and make money. I hope I can learn more. I think my English is very bad. So thank you for correcting this.

I think you are going to be fine also!!  I think that people will appreciate your effort, and besides, you know a lot of English already.