Before setting up a site, you need to have a business plan for it, and that includes two key factors: 1, how you are going to monetise it; 2, how you are going to generate the content. A field like tech, games and gadgets is, as you well know, absolutely saturated; there are squillions of sites out there covering those topics, and some of those sites are really good ... and you don't want to be competing against sites that are really good!
So you need to think about what you can offer that other sites don't. Can you be first with the news? That's a tricky one - unless you have inside contacts, you're going to be largely limited to reading press releases and what other sites have already written. So to be one of the first, you're going to have to devour press releases as soon as they come out and work them into articles. Do you have knowledge or skills that are better than most other people? If so, you might be able to take an old topic and put a new slant on it. You don't have to be an expert, just to find an angle that other people haven't.
At the end of the day, being a successful writer is not easy, and that is particularly true when you're covering a sector that hundreds and thousands of other people are already writing about. If you are passionate about it, make sure that is reflected in your writing. Give your readers more than they're getting from other sites. Talk to people IRL and online, and find out what they're most interested in, and any areas where they feel the current clutch of tech sites out there is lacking - that might give you some pointers to where there is a gap in the market. And if you're still struggling to find enough topics to write about, think about different strategies, whether there's another business model you can use to develop your website without as much authorial content.
(This is why I have never blogged. I know that after week 3, I would run out of ideas completely!)