Firstly, you want to make sure that your partner of choice is righteous, and good for you. Then you must state your intentions with your partner, and remember that zina is haram. You then go to your parents and your partners parents to ask for a blessing for marriage (aka your nikkah). Then you should plan your nikkah and get married islamically.

To marry a woman, you must contact one of her mahrams (that is to say her father, brother or paternal and maternal uncles) then you organize a meeting with the woman’s family, this is called a muqabala during this muqabala you will have the right to get to know each other this is the time to ask questions and not to hesitate you can organize the number of muqabala you want without going overboard of course, I hope I have been clear ask me questions if you did not understand something and Allah knows best

Asalamualaikum warahmatullah, I can not say with confirming how the prophet pbuh Got married but I for sure know that the only mandatory things in an islamic wedding is nikkah and mehr , mehr for the safety of woman( whatever is in the budget of a man and nothing beyond it) nikkah at home or mosque with closest family members as attendees and witness’s , wasting money is forbidden in islam anyway