How complicate is our immigration case?

You will need to get a joint sponsor to sign the affidavit of support on behalf of your spouse.

Since your fiance entered the U.S. legally, if you marry him, you can petition the government for him to become a permanent resident. One of the documents you would have to file is an affidavit of support. In it, you would have to show that your income exceeds $28,813 a year (if your fiance is authorized to work in the U.S., you can add his income to yours; if you or he have substantial assets (money in the bank, real estate, stokes or bonds), you can add 20% of the assets' value to the income). If your income plus your future husband's authorized earnings in the U.S. plus 20% of your and his assets do not add up to $28,813, you still have to file an affidavit of support, as the primary sponsor, and find someone who would agree to become a co-sponsor for your husband. Co-sponsor does not have to be a relative - it can be anyone who is a U.S. citizen or permanent resident and has sufficient income (or assets). What income is sufficient for this purpose depends on the size of the co-sponsor's family: for 1 person, the minimum is $13963 a year; for each additional member of co-sponsor's family, add ~$5000; your husband would have to be counted as a member of co-sponsor's household (and so would all the immigrants the co-sponsor co-sponsored previously). If you find a co-sponsor who has sufficient income, your own financial problems would not matter for your husband's adjustment of status.

It sounds like you'll need a co-sponsor. If your fiance can currently work legally in the US under his current status you may be able to include his income for the Affidavit of Support.

As long as you have enough income from 2011 and 2012, you will be fine. If you do not have enough income to sponsor your husband, you can find a co-sponsor.

It can be somewhat complicated. The immigrant must prove that he will not become a public charge.

If your income does not meet the minimum requirement to be a sponsor, your husband can use up to two joint sponsor to meet the requirement. Each sponsor must submit an affidavit of support, proof of legal status in the US, an employment letter, and his or her latest tax return (2011).

Depending upon your tax returns, you may need to obtain a joint sponsor for the affidavit of support. If he has employment authorization he can use his earnings in addition to yours, and if he has any savings or assets those can be used as well.

As a US citizen, you can petition for your spouse, and if he entered the US with a visa, he can apply for lawful status at the same time. If you do not earn enough money to sponsor him, you can have someone else be a co-sponsor. An immigration attorney can help.

Since you are a US citizen, if your boy friend entered the US legally, you can marry him and he can adjust status here in the US. Your problem is your ability to file the affidavit of support for the I-485 case to get him the green card. Hopefully, you can find a co-sponsor. Or if your new husband has a good job or substantial assets.