The Causative Verbs Have and Let:

In order to express the notion of having someone else do something for you, use a form of have + the main verb:

--I'm having my mail forwarded.
(Someone else is forwarding it for you.)

--I had my house painted.
(Someone painted it for you.)

NOTE: The -ed form (past participle) is used after have to give a passive meaning.

Let in a causative sense means to permit:

--Please let me help you.
--Don't let them leave!

Do not use an infinitive after let.
Using A Few, Few, A Little, and Little
A few and few are used with plural count nouns:

--a few friends, few ideas, a few things to do, etc.

A little and little are used with noncount nouns:

--little money, a little rain, a little wind, etc.

NOTE: Few and little give a negative idea, conveying the notion that something is largely absent:

--They have very little money.
--We have few options remaining.

NOTE: A few and a little give a positive idea, indicating that something exists or is present:

--I have a little free time today.
--Do you have a few moments?