Not really the best anime to start but definitely a must-watch. The characters are depressing and off-putting → not for kids.
The best animes to watch first are e.g. Gurren Lagann, Trigun, Cowboy Bebop and Fullmetal Alchemist. (FMA: Brotherhood looks way better, but you can't really watch the original after Brotherhood. The original has also the cheesier opening songs to back it up ) Space Dandy is also a good pick. All of these animes have great English dub, actually I recommend the dub over sub (I haven't watched FMA in English myself, so don't take my word for the quality of the dub. I've tried both sub and dub on the others.)
Also, Evangelion is a deconstruction of the mecha genre. If you have watched mecha series before Eva, it makes the experience better. The only mecha series I had seen before watching Eva was Gurren Lagann and still enjoyed Eva a whole lot, so it's not really a nescessity.