Pronunciation is very, very difficult to learn by yourself.
Find a qualified teacher. Learn the sounds of standard French and the corresponding IPA symbols. Learn the common spelling patterns and the corresponding pronunciation. Read simple stories out loud with a teacher until your pronunciation is "good for a student."
Then decide whether to continue with a teacher or to study on your own.
I tutor French to children after school. Twenty hours of private instruction (grammar, vocabulary, pronunciation, reading, writing, listening, speaking) equal about a school year of 200 hours of group instruction. In general, when working on pronunciation, my students are "good for a student" after five hours of instruction and practice.
Good luck to you.