You need to include all the forms you received that have withholding. This includes W2s, 1099-Rs, 1099-DIVs and so on.
You should staple the forms you are sending with the return to the front of the return. You will need to remember to sign and date the tax return.
If you entered in totals for your 1099-B, rather than the individual transactions, and there are unreported transactions, you will need to include a copy of your 1099-B. If you do need to send you 1099-B, you can place it in the back of the return.
Be sure to separate the IRS return from any state returns.
There should be a cover sheet for each return that explains how and where to send it and what to include.
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