Form 1040 _is_ only two pages long. The situation you describe would not need any other attachments and you only would attach the W2. However, you say you received a 1099-B form, which _is_ the result of investments and would have to reported on additional forms. Did you mean something else, say a 1099-INT or 1099-DIV? Additional forms aren't needed for them if they total under $400 interest and $400 dividends.
