How To Play Bass

So I've Had A Regular 6 Stringed Guitar Since I Was 12 (I'm 24 Now) And I'm Okay At It. I'm Nothing Awesome, But I Know My Way Around A Fretboard. But Just Recently The Bass Guitar Has Really Sparked My Interest, And A Friend Of Mine Let Me Have His Old Fender Affinity P Bass. I Was Wondering What The Best Approach Would Be To Teaching Myself How To Play The Bass.
I Do NOT Want A Teacher At This Juncture. I Really Would Like To Teach Myself How To Play, And Am Hoping For Some Advice On Where To Start.