My buddy was much like yourself last year, new to betting baseball.
I sent him to 5dimes.com (their banner on top of the page, click on it) and he thanks me all the time.
Not only do they have their lines up the nite before the games, they have them at the lowest possibile juice you can get (5 cent line).
They also have more baseball props that I have ever seen at any book, giving you alot more options to bet on. I think 5dimes is a no brainer for best baseball book.