Hi I bought this game yesterday and I'm lovin it but I have some questions.

1) The Enchanter perk, does it give 20% per level to the enchantments you learn when you disenchant or all, even those you have already learned?
2) The Dark Brotherhood is trying to kill me and I found a letter saying it was a request, can I find out who wants me dead?
3) are the DLC's worth picking up?
4) If i buy the dawnguard DLC can i join dawnguard and still be a vampire lord?
5) Can I switch from vampire to werewolf whenever I want?

Thankyou all

Welcome. Here's your http://images.uesp.net/c/c4/Fishystick.jpg.

1) It makes no difference when you learn an enchantment. If you learn fire damage at level 2, you'll still be able to make fully powered fire damage weapons at 52.

2) No, we never really figure that out, but it's kinda, sorta implied that a certain individual in Riften may be behind it. Check the locked closet in the basemant of a certain person's house there.

3) They're good, but play the base game for now and see if they go back on sale. Full price for all 3 is 45 bucks.

4) Not sure.

5) You can acquire vampirism as many times as you want AFAIK, but you can only get lycanthropy twice.