I installed gparted, thunar etc but I don't know how to add a short cut to the menu or to the toolbar at the bottom.
Dont use Xfce4 myself, but google for thunar should create some answers re short cut.
With 'toolbar at the bottom' you probably mean the wBar. Usually applications which need that feature add their icon automatically.
To create an icon of your own, you need to create a corresponding tcz extension. Will take some hours to learn. If you are interested have a look into the folders /usr/local/tce.icons and /ust/local/tce.menu and get an understanding what other applications enter there and how these entries are mirrored to the file /usr/local/tce.wbar.
Understanding the wBar principle you can create a mirror folder structure of your own pointing to your own icon and your own script which should be executed when the icon is clicked.
As TC recreates the whole /usr folder on each boot, you need to convert your mirror structure into the tcz extension needed for that recreation process.
Packing that mirror folder structure with the extension squashfs-tools-4.0.tct will result in the needed extension and moving that extension into the /mnt/hda1/tce folder will result in showing up your new icon as part of wbar.