You seem to prefer a style printing only the initials of the first names, so we use firstinits=true as package loading option.
You also want a "Last, First" name format for all names, so we issue \DeclareNameAlias{sortname}{last-first}. To get rid of the final "and": \renewcommand*{\finalnamedelim}{\multinamedelim}.
No formatting directives are applied to title by
\DeclareFieldFormat*{title}{#1}
To strip the year of the parentheses, add the following to your preamble
\renewbibmacro*{date+extrayear}{%
\iffieldundef{\thefield{datelabelsource}year}
{}
{%\printtext[parens]{%
\setunit{\addcomma\space}%
\iffieldsequal{year}{\thefield{datelabelsource}year}
{\printdateextralabel}%
{\printfield{labelyear}%
\printfield{extrayear}}}}%}%
To change the order to "Institution, Location", we use
\renewbibmacro*{publisher+location+date}{%
\printlist{publisher}%
\setunit*{\addcomma\space}%
\printlist{location}%
\setunit*{\addcomma\space}
\usebibmacro{date}%
\newunit}
\renewbibmacro*{institution+location+date}{%
\printlist{institution}%
\setunit*{\addcomma\space}%
\printlist{location}%
\setunit*{\addcomma\space}
\usebibmacro{date}%
\newunit}
\renewbibmacro*{organization+location+date}{%
\printlist{organization}%
\setunit*{\addcomma\space}%
\printlist{location}%
\setunit*{\addcomma\space}
\usebibmacro{date}%
\newunit}
To get rid of the "in" for @articles try this:
\renewbibmacro{in:}{%
\ifentrytype{article}{}{\printtext{\bibstring{in}\intitlepunct}}}
The following will format the volume and number as "#vol (#nr)".
\renewbibmacro*{volume+number+eid}{%
\printfield{volume}%
\setunit*{\addspace}%
\printfield[parens]{number}%
\setunit{\addcomma\space}%
\printfield{eid}}
MWE
\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage{csquotes}
\usepackage[style=authoryear-icomp, dashed=false, autocite=footnote, maxcitenames=3,
mincitenames=1, maxbibnames=100, sorting=nty, firstinits=true, backend=biber]{biblatex}
\usepackage{filecontents}
\usepackage{hyperref}
\begin{filecontents*}{\jobname.bib}
@unpublished {mi:2009,
author = {T. Miller and X. Meyer and K. Nahel},
title = {Arbitrary title: extensive latex work pays of at university most likely},
type = {Unpublished working paper},
institution = {Random University},
location = {Random location},
date = {2009},
}
@inproceedings{author2010title,
AUTHOR = {Smith, Agent},
TITLE = {{Entangled in the Matrix}},
eventtitle= {Cyberwhatever Symposium},
ADDRESS = {Berlin},
DATE = {2010-06-01}
}
\end{filecontents*}
\addbibresource{\jobname.bib}
\addbibresource{biblatex-examples.bib}
\renewcommand*{\finalnamedelim}{\multinamedelim}
\DeclareNameAlias{sortname}{last-first}
\DeclareFieldFormat*{title}{#1}
\DeclareFieldFormat*{journaltitle}{#1}
\renewbibmacro*{cite:labelyear+extrayear}{%
\iffieldundef{labelyear}
{}
{\printtext[bibhyperref]{%
\printtext[parens]{%
\printfield{labelyear}%
\printfield{extrayear}}}}}
\renewbibmacro*{date+extrayear}{%
\iffieldundef{\thefield{datelabelsource}year}
{}
{%\printtext[parens]{%
\setunit{\addcomma\space}%
\iffieldsequal{year}{\thefield{datelabelsource}year}
{\printdateextralabel}%
{\printfield{labelyear}%
\printfield{extrayear}}}}%}%
\renewbibmacro*{publisher+location+date}{%
\printlist{publisher}%
\setunit*{\addcomma\space}%
\printlist{location}%
\setunit*{\addcomma\space}
\usebibmacro{date}%
\newunit}
\renewbibmacro*{institution+location+date}{%
\printlist{institution}%
\setunit*{\addcomma\space}%
\printlist{location}%
\setunit*{\addcomma\space}
\usebibmacro{date}%
\newunit}
\renewbibmacro*{organization+location+date}{%
\printlist{organization}%
\setunit*{\addcomma\space}%
\printlist{location}%
\setunit*{\addcomma\space}
\usebibmacro{date}%
\newunit}
\renewbibmacro{in:}{%
\ifentrytype{article}{}{\printtext{\bibstring{in}\intitlepunct}}}
\renewbibmacro*{volume+number+eid}{%
\printfield{volume}%
\setunit*{\addspace}%
\printfield[parens]{number}%
\setunit{\addcomma\space}%
\printfield{eid}}
\begin{document}
\cite{mi:2009,markey,wilde,knuth:ct:a,baez/article,reese,itzhaki,cicero,author2010title,bertram}
\printbibliography
\end{document}
gives

In the other hand if you read the biblatex manual (sections 2.1 and 2.2) you'll see that exists few basic fields for each kind of reference, and many other optionals. Your example in the journaltitle is wrong, you should use instead
– Aradnix Dec 30 '13 at 02:35ìnstitutionandlocation. Finally the inclusion of these filds depends of the style you're using for.addendum. – Aradnix Dec 30 '13 at 02:37@articleat all, but rather a@reportor a@unpublished(see thebiblatexdocumentation for details). "Unpublished working paper" would then betype, "Iceland University" would beinstitution, "Alaska"locationfor the former. – moewe Dec 30 '13 at 08:48date+extrayearto get what you want, but it would be better to have a full MWE before tackling that. It would also be better to ask your "related question" in a new question. As it stands it has almost nothing to do with the issues discussed here. – moewe Dec 30 '13 at 09:07