from your post, my understanding is that your wife is still in her country. You can file the I-130 and after approval, go through consular processing. You will need a joint sponsor. As always it is best to work with an attorney.
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Yes - will need a co-sponsor.
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No need to worry about your lack of earnings. You will simply need to obtain a co-sponsor. Consult with an experienced immigration attorney for guidance.
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