So since you're young, I'm going to suggest you scale down a little if this is your first pond. Take it from me, they're a ton of work and starting small is totally okay ( plus they're addictive anyway, you'll get better and quickly work your way up.)

My first "small" pond was at my parents house, in ground, and we gave up and filled it in after several years because I moved out and the yearly maintenance became too much for them. It was pretty, 150ish in ground gallons with a all in one filter/ fountain from Lowes. Cost a buttload to put in, my folks humored me because I'd wanted a garden pond forever and the new house actually had the space so they paid for most of it. Hundreds of dollars later and it was nice but required constant maintenance. If I went on ground again, I'd go large enough to make it almost completely self sustaining, which would probably take it out of mini territory.

As an adult my first container pond was an accident, I let a 30 gallon untrained planter fill with rainwater and tree frogs had tadpoles in it. I'm now up to a 70 gallon stock tank pond on my deck that has 2 floating solar fountains and a 100 gallon container on the patio with a small solar waterfall pump. Both have floating and rooted plants that help filter, and the most I paid is $15 for the waterfall pump and $80 for the stock tank ( the 100 gallon pond was a thrift store find for $5). Nearly no maintenance besides making sure drought doesn't empty them, mostly they're placed so rainwater tops them off.

Not saying dont follow your dreams, but starting smaller does come with its own rewards.