Hi Svyatoslav. I read the whole tread of some good and a few cute silly answers. I think that all the things you said-network, background, money-are all important. I'd recommend that you start off by using AngelList, here is the link---} angel.co
And search for Angels Investors in your area, there you will be able to see the area that they invest in (e.g. Clean Tech) and how many followers they have, as well their LinkedIn, Facebook, and Twitter links. Perhaps they may be VCs that do seed investing, if so, then check out their company's website. Find out what year their Fund is in, you are ideally looking for year 1, 2, 3 of a typical 10 year Fund. It's a small world, so everyone knows everyone, so be careful with reputations as people aren't willing to say honest things about the bad apples, so you have to be focused and use your judgment wisely. You could also use Meetup.com
or just Google search when they are holding or participating in events to get a sense of what they are like in person, and see if they welcome "Executive Summary" submissions via email cold. If you want dumb money, then any investor will do. But if you want him or her to add real value to the startup, then you have to do your research and search a good fit in terms of values and goals.