Are you a U.S. citizen, a resident alien, or a nonresident alien? If you are a nonresident alien you cannot use TurboTax to file your U.S. tax return. You have to file Form 1040-NR, which TurboTax does not support.
Being a resident alien or a nonresident alien is not simply a matter of where you live. If you just arrived in the U.S. recently and you do not have a green card, you are almost certainly a nonresident alien, even if you are living in the United States. For details see Chapter 1 of IRS Publication 519, U.S. Tax Guide for Aliens. You will probably find other parts of the publication helpful as well. It will confirm your impression that U.S. tax is complicated. Publication 519 is available in a few other languages besides English: Spanish, Russian, Korean, Vietnamese, and Chinese.
You might get other forms besides 1099 and W-2. There might be other things you have to enter in your tax return that you do not get a form for.
There is no plain Form 1099. There are about 20 different kinds of 1099 forms. All 1099 forms have one or more letters after the 1099, such as 1099-INT, 1099-DIV, 1099-B, 1099-NEC, 1099-R, and 1099-G.
