Please note that "Kiddushin" refers to the initial stage of marriage, at which point the husband and wife are not yet permitted to each other, and then "Nisuin" refers to the second stage, which completes the deed.
General Details of the "Kiddushin" Stage in Marriage
Meals in honour of kiddushin and marriage
Potential relationships for which kiddushin is ineffective
The "Kiddushin" Declaration / Her Response
Kiddushin via Payment of Money or its Equivalent - כסף
Kiddushin via a Bill of Kiddushin - שטר
Kiddushin via Intercourse - ביאה
The Courts and Marriage
Conditional marriage to a woman who is not yet available
Yiud - Marrying a Maidservant into the Family
Kiddushin on Chol haMoed