I'm not an Advocate so I can't tell you what is legal and what isn't.
I suggest you to write more about interesting topics than sharing "malwares", try to write about it, make interesting analzation, do reviews for new tools, try to be a whitehat hacker will give your blog more power and vistors that pays for softwares and click on ads.
in my opinion you should use a bit of a laugh it can't do any bad

if you really want to make money online stop asking about the perfect way, just read this forum, understand the concept and take actions! get a webhosting, install wordpress (it is free!) download a nice theme (you can search the theme download section) and write your firs 5 posts! add new posts every day/week, and start building backlinks you can start with submitting to directory submitions and go to relevant forums in the nicle of your blog, add signture to your profile with following backlink, and write helpful posts! take 30minutes every day to do it.. (you can make at least 5-10 good backlinks this way). install relevant CPA from CJ and adsense. let your friends know about your blog use twitter and facebook to share your post whenever you add new posts to your website. after a few weeks you will know what you should optimize according to your traffic and the comments from your blog readers! START AND TAKE ACTIONS NOW..
Remember: reading about "how to make money online" won't make you money online without taking any actions. it is very simple just start trial and error didn't kill anyone (yet).
Good luck! (Rep & Thanks won't kill you either ;P)
Would it be legal to give "Try it yourself"ware on the site?
Like I could use sharecash or similar to host the source codes of the relevant tools for readers to test? as examples. (I love programming all day and all night and might get the odd-extra viewer).
How would I determine the writing style?
I usually use a LOT of code and dry literal typing when writing articles. Would this be a good way to go? (like Microsoft has for developers) or would it be better to have a bit of a laugh with it like some of the cheaper newspapers?
tl;dr
Better like a textbook or a pop-magazine?
Is it legal to share malware source code for samples/educational purposes?