Hello.

I’m Nnew ton the web site .

You can also say "site" for short

I Have'm doing a challenge, a purpose or amy goal is to speak eEnglish fluently in 31 mayby May 31st.

We say that we "do" challenges.

"English" (and all languages/nationalities) as well as the names of the months are capitalized

BI am doing this because iI want to live in aAmerica in jnext July with m’y family ;.

Try to avoid beginning sentences with "because."

"I" and the names of countries are always capitalized

I would like to stay in Atlanta.

Create a coffee shop (healthy) ,I want to open a healthy coffee shop in Buckhead.

Beginning a sentence with "create" means you are using the imperative and telling us (the reader) to create something.

This would be described as "opening" a business

And after inEventually, I will expand to thée best place in aAmerica.

I'm not sure to understand. I think you mean you will begin your business in Buckhead/Atlanta and then later open another coffee shop in a better place, so I edited for that. I would be more specific here and say the city you mean, because there is no universally acclaimed "best place in America."

At the begining I mMy experience is in intéeriorisé design, but I need a challenge for when I was ingo to America.

I am lost here as well. To fit the rest of the context of your post, I edited to say that you have been working in interior design and speak about going to America in the future tense. Sorry if this is not what you meant to say