If you're in it for the long term you might want to go with the army that has the models you like the look of...you are going to be spending a lot of money and time on getting them to the 'playing' stage, well usually anyway.
Orks and Eldar aren't good starting armies, they can be very unforgiving. Ork armies are hard because you have to be willing to lose a few boyz to get the rest of them stuck into close combat. Eldar aren't because I started with them and I know how frustrating it got to play an army the was filled with specialists.
My advice to you would be to go as Chaos Space Marines. They have all the tenacity of a space marine, and yet they have a hell of a lot more punch. I've have seen nothing but competetive armies when it to Chaos, and they just look so damn cool!
If you like Necron's go for them! they are not that popular since they are an older model line but they have a Remake coming up (Or at least they should) so it couldn't hurt to start a base collection not to mention there easy to paint and Very easy to play!
"DEM SPOIKY LIEK MUHREENZ BE A GUD ARMEH TO PLAY" Is how it would sound if I was an ork with my speech impediment
When it comes to a new army, its best to look around and maybe borrow some codices from friends (better yet, ask to try out their army) and you will eventually find one that fits your niche
The space marines, and chaos space marines have a wide variety (more-so on the SM side) and can fill quite a few niches but being space marines, alot of people aready have them and youll be "another marine lover"
Luckily the chaos marines give you a nice dose of marine sexyness as well as being SO MUCH COOLER (coolness has a price, the chaos marines give lots up to be this cool mang)
But every army can be a new army, read about them, borrow armies, read their codex. There is no BEST army (though space marines and tyranids are currently at the top because they are the most updated, they get updates to counter other armies first, thus they always get to be better at some point, but don't let this fool you) Even dark eldar, still in 2nd edition (the game is not 5th edition) are still a terrifying race in the hands of a master (oh this that a landraider? DARK LANCE HAR HAR!)
as some one said before, there is a nice thread on the forums that helps you pick your army, good hunting
Well I accidentally started with 'nids(okay on purpose but I didn't know they were hard) back in 4th ed. I lost 9/10 games for a month or so then someone started teaching me to play and I started to stealer spam, I destroyed friendly and tournament play alike. Almost all armies have a way to play that's easy for beginners, although Eldar and Orks not so much. Overall I would still suggest 'nids overall for beginners because it has they most useful battleforce, but maybe I'm biased.
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