if that is your focus then having your own SEO optimized blog targeting long tail keywords is possibly the best option..you have your own space for creative output and you can get much more targeted audience since they are actually searching for those keywords..for your blogging needs you can choose Ghost.org ..easy to setup and start writing..extremely fast and SEO friendly..excellent in-built editor.. can get started for $9 per month..don't waste your time on wordpress and all those plugins and crap..it's a waste of time..

Ghost has membership features built in..you can choose to enable that and build a community if you want..for your audience.

since SEO can take some time to kick in..make use of LinkedIn and Twitter for their inbuilt distribution ..high level content related to Marketing& sales --systems & automation --A&F works very well there..gets a lot of shares..you can write other detailed stuff on your blog.