Need help for my uk spouse visa

Hello All , Am A moroccan who got married with a pakistani man living in the uk. Now we are going to apply for a uk spouse visa, I heared about a member here He helped lots of people i found his name in many forums his name is xxxxxxxx. We read the documents that we need for visa spouse but the thing is i dont know by what i will start and how i will orgonize everything what is first and what is last. I want to do everything correct so they wont reject my application visa. How many pictures shall i put and how many conversation and plz who can help me to write things to prove them that im in genuine relationship i have been with my husband for 3 years now and i knew him by my sisters husband cz they have same jobs , im really confused and i dont know by what i will start and dont know how to write the letter about the relationship cz i want it to be more proffessionel in words
Kind regards

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https://www.gov.uk/join-family-in-uk/overview