Which Star Wars book should I read first? Please help?

You should follow the timeline and go all the way back to the beginning and read the Lost Tribe of The Sith series. Then read the new Old Republic novels that are coming out and then the Darth Bane novels. That's what I have been doing because for me it is easier to understand if I start at the beginning. (Which really there are no books that go to the beginning but the closest you can get is the Lost Tribe of the Sith series). Only do this though if you are planning to dedicate a lot of time to reading Star Wars novels because there are A LOT of them and it won't do you much good to start at the beginning if you are only going to read a few. I am planning on trying to read them all but I don't know if I will ever be able to accomplish that.