You should start with the foundational base spirits like gin, bourbon, tequila, rum, brandy, scotch, and vodka. Then add sweet and dry vermouth, Contreau, some mixers like tonic and soda water, fresh citrus for juicing, and last but not least Angostura bitters and orange bitters which are essential.
Well a few staples to any good liquor collection would be one, kahlua of course for making white russians, Vodka preferably Grey Goose this is used in many drinks and mixes well with many other drinks. Patron, you always need a little tequila for a trip south of the boarder. These should all be in a liquor collection.
A well-rounded liquor collection should include rarities, such as private stock or labeled liquors. Most liqour brands offer these in silver, gold, and platinum versions.
Some simple things like vodka, rum, and gin are always popular with people. They can easily be mixed with many things which makes it easy when you have guests, because some people don't like to drink it straight.
A good collection should include bottles for their shape, historical or entertainment value taking into account the relevance of the country in the production of a specific type of liquor.
A liquor collection needs to have a good variety of all available liquids. It would be wise to start with these products: gin, vodka, various rums, alize, scotch, amaretto, and some different flavored schnapps.
