We use a little and a few to talk about the amount of something. To understand which term to use, you must understand uncountable nouns and plural nouns.
A little is used with singular non-countable nouns i.e. rain, traffic, love.
a little + uncountable noun
There's a little food left on the plate.
I put a little money into the envelope.
We only have a little time to speak.
A few is used with plural nouns i.e. cars, people, houses.
a few + plural noun
There are a few clouds in the sky.
Let's sing a few songs.
A few of my school friends live abroad.
Now decide if these sentences need a little or a few: