Start by booting up Alpine (see these instructions on how to do that)
When you Alpine is up and running, do the initial setup.
Install basic desktop system and gnome packages.
This might take a few minutes depending on your network speed.
Video and Input packages
You might also want to install a package suitable for your video chipset and input devices.
For example, if you have an Sis video chipset install 'xf86-video-sis', for Intel video chipset install 'xf86-video-intel'.
and / or
Run 'apk search xf86-video*' to see available xf86-video packages.
Run 'apk search xf86-input*' to see available xf86-input packages.
If you installed your Alpine Linux as a VirtualBox or VMWare guest you might find it handy be able send ACPI shutdown.
Configure xorg-server (optional)
You can configure xorg-server and make your modifications
This will result in `/root/xorg.conf.new`. You can modify this file to fit your needs.
(When finished modifying and testing the above configuration file, move it to `/etc/X11/xorg.conf` for normal usage.)
Adding udev might help you with some finicky hardware like touchpads.
Adding evdev might also be necessary, for example if the keyboard doesn't work in X...
Create user accounts
Create a normal user account.
Optionally, give that user sudo permissions in /etc/sudoers.
Start your desktop
Start lxdm and log in with your new user.
Once you have verified that it actually works you can make lxdm start up at boot:
If you are unable to login, check /var/log/lxdm.log, there may be output there from X to indicate failed modules, etc.