Can I start a sentence with a singular noun with no article?

Solution 1:

Countable nouns need an article or similar, if singular:

A consumer will fill out a rebate form.
Each consumer will fill out a rebate form.
The consumer will fill out a rebate form.
My dog ate my homework.

Generics/uncountable nouns need to be used without:

Blood is running through the veins.
Water will be refilled at the next Oasis.