Study Islamic Law and choose a school. In Sunni Islam, religious law is divided into four schools of thought. Look into the different schools and choose the one that appeals most to you. Subscribing to a school will inform your interpretation of Islamic law as revealed in the primal sources of Islam [Quran and Sunnah] Note that all schools are equally valid. The officially recognized schools are:Hanafi. The Hanafi School was founded by Imam Al A'dham Nu'man Abu Hanifa and is the most widely practiced school and has the most information available in english, it ranges from the widely secular Turks to the Ultra-Orthodox Deobandis and Barelvis. Most Hanafis live in the Indo-Pak subcontinent, Turkey, Eastern Iran, parts of Egypt and many Non-Muslim Majority countries
Shafi'i. The Shafi'i school was founded by Imam Abu 'Abdillah Muhammad Al-Shafi'i and is the second most populous school and is the majority in Egypt and East Africa as well as Yemen, Malaysia and Indonesia, The Shafi'i school is known for their complex legal system.
Maliki. The Maliki school was founded by Imam Abu Anas Malik who was a student of Imam Abu Hanifa it is the majority school in North and North West Africa, as well as a reasonable following in Saudi Arabia. Imam Malik took his practices from the people of Madinah one famous Maliki scholar is Hamza Yusuf.
Hanbali. The Hanbali school was founded by Imam Ahmad Ibn Hanbal and is practiced almost exclusively in Saudi Arabia, with some followers in the West. The Hanbalis place great emphasis on creed and ritual practice and it is considered the most conservative and strict.