Hello Ernst there have been a lot of great answers here so far but here is my personal opinion
Its rather easy to start a blog you go to http://www.wordpress.com and chose a good name for your SFI blog that will be the address where you would direct traffic to. It would look similar to this http://www.sfimg.wordpress.com. then you will need to start adding information to your blog your first entry could be a longer ad from our approved text ads found here: https://www.sfimg.com/Resources/OppTextAds
The best way to use your blog to promote SFI would be to put your personal experiences with SFI and that should be done weekly. You can post things about the compensation plan or the 3 step ultra simple easy plan to be successful in SFI. If you wanted to you could also add a video on youtube to your blog for example in word press you would click add new post then click on the "code" icon then paste the embed code from youtube and finally click the "/code" link then title the video and put in a category I use videos as the category you can also place one or two banners on but no more than that otherwise it will look like a banner farm and most people don't respond well to that type of advertisements.
I would also like to recommend that you have your own website with the sub-domain being SFI it would look like this http://www.sfi.yoursitesname.com. With your main page being http://www.yoursitesname.com you could post tips and other helpful information for your downline as well as any contests you are running. Also you can upload different documents to your site like guides and the such for your team to download and view at their leasure
I hope this has helped answer your question
see you at the top
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Hello Ernst there have been a lot of great answers here so far but here is my personal opinion
Its rather easy to start a blog you go to http://www.wordpress.com and chose a good name for your SFI blog that will be the address where you would direct traffic to. It would look similar to this http://www.sfimg.wordpress.com. then you will need to start adding information to your blog your first entry could be a longer ad from our approved text ads found here: https://www.sfimg.com/Resources/OppTextAds