Got about 40 domains most are 20k exact search what's next ?

If you're lazy, just flip 'em!

If you have more capital on hand, outsource to a team and get them to setup sites and blogs on those domains. You can hire a project manager as well.

Start one-by-one, don't move on till you're finished. I had a crushing number of domains when I started, all with big plans and made the mistake of focusing 100% of my time on like 20 different sites... so basically consider each site only 5% done and absolutely no results/money, and HUGE burn-out.

So I'm re-gearing and re-focusing, finished one exact keyword .com (with a hyphen, but very general term) and finalizing some SEO before moving on.

As general advice: start with one that gets most exact searches, and think of 5-10 different topics that you can write about on that one thing (to bulk up the site). If there's an affiliate product to go with it, great. Monetize by selling the product. Alternatively, instead of focusing on MOST exact searches, you could try one that gets a lot of searches, but would be more exciting for you to research, write about, sell to, and possibly create your own product for. Something that is FUN for YOU might be more profitable than something that gets 10x the searches, simply because you're more likely to put your energy to it.

You can also setup adsense either way which is a good way to start seeing at least some return. some people will argue and say "why send people offsite" but if it's a high paying click *shrug* beats a non-paying "bounce". No reason not to combine adsense w/ affil links too. One way or the other you stand to make something, at least.

Do your best to develop mailing lists where applicable. There's a rumor that money is in the list. That's what I heard ;P

Don't spread yourself too thin: focus energies on one site at a time, make that one site profitable FIRST. If it's NOT profitable, find out WHY instead of bouncing to the next one. Your domains shouldn't cost you more than 3-400/yr, so stay focused and just ONE site that is done well can pay for the rest of them easily. THEN you move on to the next one. One atta time.