authors note he is born 100 years before luffy starts his adventure
5 years later
marsh is now 8 years old and I have become skilled with electro and I'm the best swordsman on the island my mom is making us leave the island and go to Shimotsuki Village in the east blue
authors note this is a random village I found on the wiki of islands and where zoro grew up
after arriving at the island he saw multiple people a dojo and a lot of shops first he talked to the people of the village and then checked out what the shops sold some sold food and others sold basic materials and some sold weapons like guns and swords then he went to the dojo and found an old man that looked Tough and decided to train his swords here
the next day he worked out and trained his swords at the dojo
2 years later
he was now the second best swordsman on the island
then pirates attack and fight the people of the Island and marsh attacks the captain of the crew thinking he was stronger then him and he got beaten badly but not before he gives the captain a scar on his chest and gets knocked out and awakens the next day luckily the people on the island are strong enough to not have the village destroyed(I would have destroyed the island if it wasn't zoro i wanted zoros to still live on the island cuz yea)
I realized I needed to train a lot if I wanted to become strong so I left the island without my moms permission and went to a Forrest where all the animals where stronger than me so I could get stronger and eventually I remembered about geppo and how it would be useful for me so I tried to learn it for a year and I did I practiced a movement skill with it because I'm a mink and I can jump further than normal so I jumped into the sky after running for a while and went flying off the island and I could even see another island in the distance if I upgrade this I could even jump from island to island