i need a help in project related to mechanics and design

Hi Mechanical Engineering people this is my first activity here ,im a student from palestine .

i have a project in mechanics of materials subject...it is a project of signboard with two legs and we should design it so that it gives us good saftey factor ,not all dimensions are give some are given and other should be identified to give us a good design .

i have a problem in starting this project

the project mark is just 10 marks from the whole course so i think it will be simple

i want just to have an idea of what things should i do, like how to start and what steps i must take ...can any one help me in that please?