Single domain site with multiple separate blogs

A two part project: - to describe a design for what to do - to move the design into working blogs/websites (using existing blogs/sites). The crux of the problem is that I have three and may have four blogs/websites - three at [login to view URL] and one is a paid Justhost Wordpress site. I would like to bring these together under one domain name (already registered, and also my Twitter handle) in such a way that: - mobile, tablet and personal computer users all have equally ready access/choice to the main different elements - Adsense (or other) advertising can be placed across all the blogs/sites The common theme is essentially ''me'', as: - fiction author (needing one blog and/or site) to list/describe the already written novels and talk about forthcoming ones (and possibly to sell ebooks) - technology blog (the existing JustHost site, which uses Wordpress) - a new 'visiting churches' blog (this would not only be a blog but i would have subsidiary information/photographs/maps for (say) 1000 individual urban churches - in effect becoming an information resource for others) - a consulting and copywriting site (or blog); this is currently combined with the technology blog (above) and could stay that way or be separated. The objective is to create more interest and awareness across all my activities, so they crossfertilise - as well as improve traffic via better SEO/etc. I am not committed to Wordpress (or JustHost). In fact I wonder whether a solution might also include Tumblr??? I am open to suggestions as to how this might be approached. The ability to have multiple parallel blogs is important, with (potentially) each new blog appearing on the main domain page (and pointing to the relevant sub-domain or part of a web site or whatever... Once an overall shape has been agreed, part 2 would be to implement the design and bring the existing content to the new design and take it live. To make a selection I will need some outline description of the proposed approach and technologies to be used.