We're so excited that you've decided to join the wonderful world of the Raspberry Pi. You'll never be bored ever again!
If you're new to the Raspberry Pi, the cheapest and most convenient way to get everything you need is with a starter kit. You'll also have the reassurance that the parts you're using are official compatible products.
We offer a couple of great options depending on your budget and any hardware you may already have (both are excellent gift options!):
The Pi Hut Starter Kit - The more affordable option if you already have a spare keyboard/mouse is our own starter kit. It gives you everything you need - just plug the Raspberry Pi into a monitor and your existing keyboard/mouse: https://thepihut.com/products/raspberry-pi-starter-kit
Raspberry Pi Desktop Kit - A more 'complete' (but more expensive) option is the Official Raspberry Pi Desktop Kit - it's similar to the option above, but comes with the official keyboard and mouse plus a handy beginners guide: https://thepihut.com/products/raspberry-pi-4-desktop-kit