need help writing articles

Hi everyone, so I've done some KW research and I found a niche that I think could get some traffic. Its a medical niche and I was wondering how I go about writing articles? I want to write them myself because I enjoy it and I have no money. So the niche is broad but for each article I want to talk about one form of illness in the area. So this is kinda how I think I should set the articles out. I would love any feedback possible.

Para one: Introduce the illness say you should go to medical professional, statistics ect...

para two: syptoms

para three: possible cures

Conclusion

Also should I hammer one keyword/phrase or should I try hammer more than one?if so how many?