Well first off, Clerics don't autotrain anything. As for speccing, depends on what you want to do with your cleric. I'm an active healer, so I went with the cookie cutter spec of 40 rejuv, 35 enhance, and 9 smite. Some go for 40/36. Most people don't suggest going higer than 40 in rejuv, as it's just not power effective. The highest heal spells cost way too much in power to be that helpful. At 40 rejuv you get 100% rez that folks love in RvR, even though now Heretics have monster rez.
I've never tried a smite cleric, as they havent been very good. If you really want to nuke, roll a wizard. Also, you can't be an effective group healer if you're using up your power casting smite spells. Anyway, good luck with your cleric, its a fun and challenging char to play.