Hi, welcome to SRP.
Before you do anything read everything in the library
https://shavelibrary.com/ it will set you on the right path.
I would personally buy a straight from the Buy / Sell / Trade classifieds
https://sharprazorpalace.com/buy-sell-trade/
Always a good deal to be had and beginner razors always crop up. Most importantly they will come shave ready.
You will also need a strop, brush and a decent soap or cream. There are lots of reputable vendors if you live in the US. I'm sure someone will point you in the right direction as coming from the UK I'm limited in purchases from across the pond. I have brought from griffithshavinggoods though and can thoroughly recommend.
Have fun!