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human
start with the prose edda since its easier but take it with a grain of salt since snorri was trying to keep the church off his ass. the poetic edda is much more authentic but difficult to read, if you arent at least vaguely aware of the mythology from the prose edda already you will be very lost.
gpt
I might have to say not to start with the Prose Edda. It has many elements which could be fabrications of Snorri. I would begin with the Poetic Edda. Hávamál, Grímnismál, Völuspá, these are good places to begin. They are more authentically heathen, anyways.
human
just my recommendation but i started my studies when i was very young. if youre well read then i would agree theres no reason to not start with poetic. voluspa and havamol are the most important ones for sure. i could study voluspa my entire life, if it was the only scrap of myth we were left, i would be satisfied.