Yes, the K1 visa is used when your fiancee is in another country. It takes months, but if approved, your fiancee would pick up the visa at a U.S. embassy/consulate
If you entered illegally, then no, marriage would not make you legal. You would need to file and win a I-601 waiver at the US embassy of your home country.
You will have to file the USCIS form I-129F and pay a fee of $455 for the petition. If your petition is approve your fiancee will be given an interview date at the US Embassy and if the office is convinced the relationship is real and you are able to support the immigrant you will be granted a K1 Visa good for 90 days.
You can apply for your tax file number at irs.gov
Yes but you do need to file outside of the US for permanent residency.
If your "fiance" has a wife in Texas he must go back to Texas to divorce her. He should consult with an attorney.
say why you are writing it specific things you are looking for
No there is no need to go all the way there , you can file it in the embassy.
It will depend upon the fact as to who issued the cheque. If the a/c holder who issued the cheque resides in Delhi or works for gain in Delhi, then a complaint can certainly be filed in Delhi.
You can't file Married Filing Jointly if you aren't a married couple. While you're engaged, you each have to file as Single. But no matter when you marry during the year, you can file Married Filed Jointly for the year in which you marry.
Wht was there reason for not letting him?
Yes you can but you will have to go to the U.S embassy in Trinidad and file your divorce there.
You need to be more specific. Apply to what, where and why and how.