Acarbon skeleton for cyclohexane is shown below. where on that skeleton would the substituents be located in 4-chloro-1-ethyl-2-methylcyclohexan e

Answer is in Word document in attachment.
Ethyl is on the first carbon atom and methyl is on second carbon of cyclohexane because position numbers of substituents must be determined so that they are as small as possible. And in the name of molecule, the substituent names (chloro, ethyl, methyl) must be arranged alphabetically and are prefixed to the parent name.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic