All you need now is a USB audio interface, mic stand, XLR cable, and pop filter. Closed back headphones too if you have none.
It would also be a good idea to have some acoustic treatment around you, otherwise if you're in a small room with flutter echo (clap your hands and the echo flutters) then your vocals will sound cheap and boxy from too much room reflections entering your vocals.
Cheapest interface that's quality is the Shure X2U, it's around a hundred. Followed by the Focusrite Scarlet 2i2 (if you need separate headphone and monitor outputs then the 2i4) and Mackie Onyx Blackjack.
For pop filters, the most effective ones have double screens, but you might get away with a smaller mesh screen one.
For room treatment, easiest is putting pillows, laundry, blankets, mattresses, sleeping bags, etc... around you on the floor and walls or hanging from the ceiling, whatever you can manage. Alternative is buying acoustic foam like the Soundtrax stuff, or better the acoustic cotton panels from Applegate that you can just nail to the wall or hang from large metal binder clips strung from the wall or ceiling. Amazon reviews/info below.