1. What kind of industry should I consider so that I can get easy traffic in a very, very short amount of time, considering the fact that my only objective is to reach $2000 monthly.
Health/wellness/nutrition/fitness are usually quick, high-interest industries. Definitely high-competition, though. Saturated market already.
2. What could be the most efficient way to get traffic in this case
Efficient? Buy it from Adwords. COST efficient? Organic/SEO. But organic takes time and lots of energy in content production and promotion.
3. Should I use Wordpress blog or design my website from scratch (any other suggestions?)
I prefer WordPress for nearly everything. Unless you have some specific reason not to, I recommend choosing WordPress.
4. Is there another easy way to get money for my website apart from Google adsense?
Yes, definitely. Adsense is actually a VERY low payout method of monetizing traffic.
Look into CPA marketing, or cost-per-acquisition. Affiliate marketing sites are also good options. Both take time and effort, however.
$2k/mo in web traffic revenue is a lot for solo publishers. That's an ambitious goal. Chase it, definitely. But think outside the box a bit. Adsense won't get you to $2k/mo anytime soon.
If there were (legitimate) get-rich-quick schemes lying around on the web, we'd all be doing them!
