possible essay structure

I've been having trouble coming up with an essay question, I know my theme and what I want to research but I can't focus on a question or argument for the direction of the essay. Some thoughts so far:

'to what extent was the success of totalitarian governments down to their use of propaganda posters and are their design techniques being used in modern society?'

'Exploring whether the success of the Russian revolution and nazi Germany was down to use of mass persuasion within their propaganda poster'

I want to explore the Russian revolution because I love the art movements that came out of it and surrounding it at the time - constructivism, and the whole act of revolting against the dictator for this utopian idea of communism, although it eventually went downhill, I find that initial time period 1917-1924, before Stalin came into power, really interesting. The posters were so well designed and bold.
I also want to look at the Nazi's because I'm interested in the whole idea of 'branding' that Hitler used, he managed to manipulate a huge amount of people using really clever design/advertising techniques which I think will be interesting to explore. Also the poster aesthetic is similar to that of the Russians with the simple, block design which was very different to poster design before that.

I don't know where to go from there though, I am unsure of whether to then look at modern examples of propaganda (possibly ISIS, or how politicians sell themselves now?) or how the propaganda techniques are used to advertise now? Or to not relate it to modern society at all.

possible structure:
chapter 1

• introduction - brief history of propaganda, why it is around, who it is aimed at, where it started, general overview of importance of poster
• general talk of both examples - Russia and Germany, history of revolution and ww2, why the propaganda was needed
• differences between communism and fascism, but similar uses of propaganda, how necessary it was as a tool of communication.

chapter 2

• look at design techniques used within posters - patterns, symbols, colour - their meaning and effect on people?
• look at art movements surrounding posters (constructivism, bauhaus?)
• make links between propaganda and advertising
• look and idea of 'branding' with a political leader
• look at the psychology behind the propaganda - why it was so successful

chapter 3

• look at politics today in a democratic society, how different it is - are there any similarities?
• modern day propaganda - ISIS, north Korea? 
• is propaganda more or less successful now there are so many platforms for it to be broadcasted?
• conclusion - sum up the importance of design within propaganda, and how much it influenced the people leading to the success of the Russian revolution and nazi Germany (before they lost the war)