A blog can look anyway you want. They come in endless designs, it just depends on your preference and what you are trying to do with the blog.
Are you planning on buying a domain or going with a free blog host?
If you buy a domain I suggest using Wordpress as the blog software, as it is very easy to use and there are numerous free themes.
If you are going the free blog host route I suggest using Thumblogger.com, Pornblogspace.com or Venusblogger.com
Here are a few Milf sponsors:
21 Sextury - Lusty Grandmas
Nasty Dollars - Milf Hunter
Naughty America Affiliates - My Friend's Hot Mom
Crazies Cash - All over 30
Best of luck.