How would I code the following using enumitem?

Question

I would really (really) appreciate it if someone could give me the code in enumitem that does the following:

I need just one indexing set (roman numerals) and the flexibility to change space between items in the list; space between the left vertical margin and the items in the list; and the space before and after the list of items.

I have been trying for a day to get this and have been left a broken man.

Answer 1

The following MWE builds a new list type and fiddles with the parameters you request. (In fact, you don't need to build a new list type, but can drop the \newlist command and replace newenum with enumerate henceforth.)

\documentclass{article}
\usepackage{enumitem}

\newlist{newenum}{enumerate}{1} %1 is max depth
\setlist[newenum,1]%set params for list level 1
{ label=(\arabic*), %arabic labelling
  itemindent=0.9cm, % hor. space before "bullet"
  labelsep=0.4cm, % hor. space between "bullet" and label
  itemsep=0.5cm, % ver. space between items
  topsep=1cm % ver. space before and after list
} 

\begin{document}
List Starts.

\begin{newenum}
 \item List 
 \item Continues
\end{newenum}

List Over.
\end{document}

Using that, you can fiddle with the spacing parameters quite easily. The horizontal spacing is very customisable, so I recommend checking out Sections 3.2 and 3.3 of the enumitem manual to achieve precisely what you want.