A chart telling you which bases match up with which liqueur essences is available by following this link http://aussiebrewer.com.au/base-matching-chart/ Otherwise you can find it in the menu at the top of the page, Click on the sub-heading ‘brewing info’ then click on ‘Bases Matching Chart’.
All the necessary information is listed, as each Liqueur has a Base Designed for it! Simply Mix 1 Packet of Liqueur Base into the Required Amount of Alcohol, Stir it in, and Add you Essence! Easy As That!
Cream bases are used for any liqueur that is a cream liqueur (eg: Irish Cream which imitates the taste of commercial Baileys)