Welcome to the forums
Personally I would look at starting a blog yourself to get the ball rolling, get the site indexed by search engines and building up and initial following. This will keep costs down at first, then when you have some money to invest consider expanding the site a little at a time.
Of course the site will need an income model, whether that's via advertising or paid content, bus as most sites find this can be extremely hard. If you try and start "big" with paid staff etc you can burn through money at an alarming rate, and find your investment frittered away with no return.
It's worth remembering that existing popular blogs have serious overheads, paying staff, hosting bills and other running costs.
If this is a serious business the the first thing to do is write a solid business plan!