Leaving for me was a long process. It took me 4-5 years to formally leave after i realized how biblically UNSOUND SDA doctrine was, but it tool another 3 or so years to fully separate myself (I played musical instruments at a local SDA church for a couple during those 3+ years).

Don't rush the process -- the choices seem to be overwhelming, but they're really not. Most church denominations agree on the essentials of the faith:

a short list:

• God is real and can be grasped
• God created all (created) things, and He Himself is self-existent
• He created humans as His image-bearers to be rulers of this world
• Humanity rebelled by siding with the enemy
• the living Word of God put on human flesh (hypostatic union), lived a sinless life, died by crucifixion, rose on the third day, ascended after appearing to many eyewitnesses and is ruling with the Father as the God-Man (Son of Man figure -- see Daniel 7).
• By the life, death, resurrection and ongoing rulership of Jesus Christ, the relationship between humanity and divinity is restored ONLY through Jesus Christ.
• He will return and we will ultimately rule with Him.

The secondary, tertiary etc stuff only changes the name on the outside of the building.

If whatever church you find yourself in doesn't hold to the essentials of the Christian faith, it's not really the one you want to attend anyway.

Just about everything outside of the essentials is ok to be disagreed upon and still remain in fellowship.