What is the most likely effect on a persons income if he or she has little education and a few skills

A person with little education and a few skills is likely to have a low income as he/she is not qualified to apply for a better job with a better salary as a professional.

Generally, professional jobs imply  higher studies at college. Otherwise, the person may aplly to work in different places, but even for cash tellers at shops, they aks for high school education.

They can have  what is known as a blue collar job (  jobs are performed in work clothes and often involve manual labor) but if he/she has few skills, it may be difficult.