I reckon you could manage with just one or two:
I.e. gin cocktails:
Gin Fizz (gin, lemon/grape fruit, optional sugar syrup, tonic)
Ton Collins (gin, lemon juice, sugar syrup, soda water)
Gin and sin (gin, orange juice, lemon, grenadine, ice)
Gin rickey (gin, ice, lime juice, soda water)
gin sour (gin, lemon juice, sugar syrup, optional egg white, optional bitters, ice)
I've also successfully substitutes gin into a Cosmo before, but that would need Cointreau I think.
But if you don't like gin that's going to be a dreadful week!
What about thinking of 2 cocktails you definitely like, then we could tell you what else you could make with those ingredients?
I also like the "my bar" app which you can fill in with what ingredients you have and it gives you cocktails.