Your marriage will affect your future spouse's ability to get a visitors visa in the future. A person can not generally ask for extension of their stay when here on a visa waiver. The I-140 is not the petition used for starting the process for a green card based on marriage. There are many steps involved to complete the process and the whole process, without problems (errors of missing paper work), would take about 9 to 14 months depending on the way your do it (there are several methods available). You need to talk with an Immigration Attorney. Once the Attorney understands your plans and the details of your situation, he can advise you on the best way to proceed, the documents you will need and the steps involved.
Answered on Mar 12th, 2013 at 4:04 PM