Best way is to watch two series at a time, just for the variety.
I remember the first time i started watching anime as a recommendation from my mate.
High School of the Dead, i managed to watch the whole thing, however i hated it... every two seconds i was forced to look up a skirt when i was trying to watch something compelling and well, fantastic.
The second series i watched, after a while of convincing that all anime wasn't like HSOTD (yeah i shortened it) was Death Note and it was, well check my review if you wanna know how amazing it was because i can't say in a few words (cannot guarantee spoiler free), but yeah after that i was hooked, but aever since then i always like to keep an anime on the side, so if i plan to watch a series from scratch i'll still have my on going anime like Mirai Nikki, Naruto Shippuden, Bleach, Gintama, Brave 10 and a lot more.
Good luck, make you're first one count ;) x