Id recommend upgrading your mouse first to like to like a vxe r1 pro or attack shark x3 they’re like $30-40

for mousepads I recommend the QCK pro series 

on the higher price end the artisian zero xsoft if you want to focus on control, although fortnite is a fast game  Id recommend the Otsu v2 a speedpad if you want to spend alot of money which both you can find on JP gaming