Can i get in trouble if the imigration deparment of U.S (ICE) find out about this?Can i get in trouble if i report it now?

Attorney Shusterman is absolutely correct.

Can i apply for anything, can i try do submit anything for a pardon, what can i do to go back home without any problems.

Are you saying that there is incorrect information regarding a juvenile issue that you did not know about and is not true?

You should be fine putting either since it is probably just a space constraint issue.

How long it takes to send the case to dominican republic

As the other attorneys indicated, it will depend on a number of factors. You can always call/email to follow up.

E2 treaty investment detail

It is not required that you do so but it is a very good idea because these actions may not be able to be completed in your home country.

So please let me know what happens to my H1b if it's picked in lottery? How to get my money back Incase if it's not picked? Thx

The USCIS filing fees will be returned if the case was not selected in the lottery.

What documents are required to apply for reentry permit in absence of physical Green Card.

You can try submitting copies of your Immigrant Visa.

Is the denial going to be a plus or a minus? Which proofs do we need to have as there is an age gap?

What was the basis of the K-1 denial?

Yes it is possible that ICE could be alerted.

Is it possible for him to clear things up so he can return to the U.S.

Maybe but it depends on a lot of factors such as the specific drug infraction.