If you're e.g. a dvorak user, your first step could be changing the keyboard layout:
After archiso has been booted you may want to make wireless internet connection, wired connection should be done automatically:
To check connection:
ping -c 3 archlinux.org
To ensure that system clock is accurate.
timedatectrl set-ntp true
Check the status:
Lets make sure we're using UEFI mode:
Variables in output means everything is fine. If not, the system may be booted in BIOS or CSM mode.