How to make/create a poster

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I need to create a poster about the poor people of Uk between 15th to 17th century. I need to give information and some images showing how the poor people n vagrants lived their life. I am supposed to make my poster in a A4 sheet paper In regards to that, please give me some tips/ideas how to make a poster about this. 1. What kind of title can I give 2. What information should I give. 3. About poster designs: Should I have a background color, borders etc.. 4. Format: have columns or just plain 5. Should I have just one big images or have few images here n there in small sizes n give description Please give in ur ides n tips