I'm needing any information on what needs to be submitted for the B-2. What forms, what documentation needed or that would be helpful.

B2 visa is kinda tricky as the major responsibility goes to the person overseas, the most criteria for the visitor visa is going to be based on the consulate being convince that the person will go back to their country after the visit. Here's a sample of the letter i sent to my sister in law from india to come to visit us.

United States Consulate General
Consulate General of the United States of America

Locate Consulate office




Subject: Letter of Invitation for Ms. XXXXXXXXX

Dear Honorable Consul:

1. My name is XXXXXX( name of us person sending the invitation ); I reside at XXXXXXXX
2. I am a United States citizen.

3. I am requesting that you issue a tourist (B-2) visa to XXXXX, in order
to allow her to visit me and my wife in the United States.

4. Ms. XXXXXX in Law; she is related to my wife
Mrs. XXXXXXXXXXXXXXXX, maiden name XXXX XXXXXXXXXXX

5. She will be visiting us from date--date . My XXXXXXXXX
and my wife are very closed, she’s a very honest and fun all around person,
we would love to have her with us for the XXXXXXXXX holiday. (Summer Vacation)

6. During her stay in the United States, she will stay with us at the address
stated above. I will be responsible for all of her room and board expenses
while she is in the United States.

7. Upon the termination of her visit, she will return to xxxxxx, India.

8. Ms. XXXXX will be presenting this letter to you, together with
other evidence showing her close ties to XXXXXXXX(City home Country), {{{ This is the part that's very important, showing Link that ties the person to their homeland. My sister in law presented her Job letter, and her vacation request and when she is due to come back to work, her rental agreement for her aprtment, her bank account statements) and to assure you that
she will return prior to the expiration of the visa once issued by your consulate.


Your kind consideration to this request will be greatly appreciated.

Yours truly,

________________________

________________________

You will need to supply some background if you want a sensible comment.

You details include Germany, they can usually travel on the VWP and Nigeria where it would be extremely difficult to get a visitors visa.