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Hello. I would like to change the enumerate labels in LyX from numbers (1,2,etc.) to letters((a),(b),etc.) right from the beginning.

I know that once I put for example
1. This is my first item
Then if I put 2.
and press alt+shift+right it exchanges the "2" into "a". However, I want the "a" to be ...

I have also posted this in tex.stackexchange, for further results and discussion of this.
http://tex.stackexchange.com/questions/ ... nvironment

You could change \leftskip in that environment, such as here, where you can see indentation across a page break:

\documentclass[a4paper,10pt]{article}
\usepackage[english]{babel}
\usepackage{blindtext}
\parindent0em
\parskip\baselineskip
\begin{document}
\blindtext[3]
\par
\begingroup ...

[…] The environment was not created solely for this purpose, but I want the presented text to be indented. […]
So please tell us for what purposes the environment is created. What is it for? What will it do? At the moment you only want indentation. For this single purpose you don't need a new ...

Thanks, but I do want the indentation inside the environment. The environment was not created solely for this purpose, but I want the presented text to be indented. Is there a simple command to achieve that in the environment definitions? And how do I base my environment on a list if I want to? (btw ...

\documentclass[a4paper,10pt,english]{article}
\usepackage{babel}
\usepackage{blindtext}

\newenvironment{myEnv}{\addtolength{\parindent}{5cm}}{}

\begin{document}
\blindtext

\vspace{2ex}
Here is the new environment, with left margin the same as regular text:
\vspace{2ex}

\begin{myEnv ...

I want to use indentation in a new environment I created. However, I do want to enable page breaking inside the environment, so the the \minipage environment is not suitable choice for me.
How should I define the indentation?
I tried

\addtolength{\textwidth}{-5cm}%

and also

\addtolength ...

great. thank you so much

I want to produce two horizontal rules as in the picture
I tried to use a \newline and a \vspace with negative height to compensate for the too-big space between text lines, but it doesn't work.

\documentclass{article}

\newcommand{\myline}{\noindent\rule{\textwidth}{2pt}\newline\vspace{-0.9 ...

It is available, I have MiKTeX and I have it installed without even knowing. Did you check within your packages?
For a quick check, try the folloing code:

\documentclass[a4paper,10pt,english]{article}
\usepackage{circuitikz}
\begin{document}
\begin{figure}[h]
\begin{circuitikz}
\draw (0,0) to ...