Prior to filing for lawful permanent resident status, you may want to meet with a U.S. Immigration Attorney. They can not only help make sure you are completely eligible, they can also help you prepare your forms and documents and assist with any complications that may arise. You can check U.S. Justice Department's List of Pro Bono Legal Service Providers to see if there are attorneys or legal resources in your area to help you prepare for your immigration filings free of charge. If someone, such as a relative or your employer, is sponsoring your immigration, they will need to file an immigrant petition for you. If you qualify to file for yourself, you need to file your petition. The exact petition and documentation you need will depend on how you qualify for lawful permanent resident status. All forms are available from the USCIS website.  If you are unsure what forms you need, talk to your immigration attorney or an immigration services office in your area. You may also be able to receive advice over-the-phone if you cannot get to an office. If you already have an approved immigrant petition and visa, you may just need to file the I-485 application form. Form I-485 - Application to Register Permanent Residence or Adjust Status is essentially the application form for your green card. The form is about 18 pages in length and requires you to provide details about yourself, your family, your employment, and your eligibility. Once fully completed, the form will need to be submitted to the correct office. The office you will submit to depends on how you qualify for your status. Check the USCIS website to find the correct filing address for your eligibility category: https://www.uscis.gov/i-485-addresses. You will need to submit your filing fee along with your I-485. You may submit a check along with your application, or pay online using a credit card. The fee structure for filing your I-485 is:  $750 for children under 14 filing with the I-485 of at least 1 parent $1,140 for children under 14 not filing with at...

TL;DR in Indonesian:
Temui pengacara imigrasi. Mintalah sponsor Anda untuk mengajukan petisi imigran. Isilah Formulir I-485 dan serahkan kepada USCIS. Bayarlah biaya permohonan. Buat janji pertemuan untuk layanan biometrik. Hadiri wawancara untuk kartu hijau. Hindari bepergian ke luar negeri saat permohonan Anda masih dalam proses.