Help Me Build My First PC

Im building my very first PC soon and don't know much about it since ive never even had a PC to begin with. I think I have chosen some good parts with a $3000 (CAD) budget but if there are better parts or adjustments I should utilize please tell me.

List of Parts;

CPU: AMD Ryzen 7 7800x3d

CPU Cooler: Arctic Liquid Freezer III Pro 360 A-RGB - Liquid Cooling

Motherboard: ASUS ROG Strix B850-A Gaming WiFi AMD AM5

RAM: Crucial Pro DDR5 32GB (2x16GB) 6400MHz

GPU: Asus Prime Geforce RTX 5070

SSD: Crucial P310 2TB 2280 PCIe Gen4 3D NAND NVMe M.2 SSD

PSU: be quiet! 750w power supply 80 plus gold

(Also im not entirely sure where I should buy from so any advice on what sellers to trust is appreciated)