The following code implements some of your wishes for the bibliography.
Formatting for a lot of fields is dropped via
\DeclareFieldFormat*{citetitle}{#1}
\DeclareFieldFormat*{title}{#1}
\DeclareFieldFormat*{journaltitle}{#1}
\DeclareFieldFormat*{maintitle}{#1}
\DeclareFieldFormat*{booktitle}{#1}
The name format "First, Last/Second, Author" is enforced via
\DeclareNameAlias{sortname}{last-first}
\DeclareNameAlias{author}{sortname}
\DeclareNameAlias{editor}{sortname}
\DeclareNameAlias{translator}{sortname}
\renewcommand*{\multinamedelim}{\addslash}
\renewcommand*{\finalnamedelim}{\multinamedelim}
To get rid of months/volumes and number information
\AtEveryBibitem{%
\clearfield{month}%
\ifentrytype{article}
{\clearfield{volume}
\clearfield{number}}
{}
}
You can get rid of further fields by adding them to the list, for example
\AtEveryBibitem{%
\clearfield{month}%
\clearfield{series}
\clearlist{publisher}
\ifentrytype{article}
{\clearfield{volume}
\clearfield{number}}
{}
}
Be aware though that there are different types of "fields", there are field, list, and name, and one needs to use the appropriate \clear[...] macro.
The name is separated from the title by a colon and the final period is dropped
\renewcommand*{\labelnamepunct}{\addcolon\space}
\renewcommand*{\finentrypunct}{}
This is for date formatting (publisher is dropped, plus comma before location)
\renewbibmacro*{publisher+location+date}{%
\setunit{\addcomma\space}%
\printlist{location}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{location+date}{%
\setunit{\addcomma\space}%
\printlist{location}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{journal+issuetitle}{%
\usebibmacro{journal}%
\setunit*{\addspace}%
\iffieldundef{series}
{}
{\newunit
\printfield{series}%
\setunit{\addspace}}%
\usebibmacro{volume+number+eid}%
\setunit{\addcomma\space}%
\usebibmacro{issue+date}%
\setunit{\addcolon\space}%
\usebibmacro{issue}%
\newunit}
\renewbibmacro*{issue+date}{%
\printfield{issue}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{series+number}{%
\iffieldundef{series}
{}
{\printtext[parens]{%
\printfield{series}%
\setunit*{\addspace}%
\printfield{number}}}}
MWE
\documentclass[a4paper,11pt]{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[style = numeric,backend=biber,autocite = superscript]{biblatex}
\usepackage[babel,german=quotes]{csquotes}
\begin{filecontents*}{\jobname.bib}
@Article{BlaBla:1999,
author = {Jobs, Steve and Gates, Bill},
title = {Steve Jobs},
subtitle = {In Memory},
journal = {Weekly Apple},
location = {Silicon Valley},
year = {1999},
volume = {1},
pages = {44--45},
month = {january},
}
\end{filecontents*}
\addbibresource{\jobname.bib}
\addbibresource{biblatex-examples.bib}
\DeclareFieldFormat*{citetitle}{#1}
\DeclareFieldFormat*{title}{#1}
\DeclareFieldFormat*{journaltitle}{#1}
\DeclareFieldFormat*{maintitle}{#1}
\DeclareFieldFormat*{booktitle}{#1}
\DeclareNameAlias{sortname}{last-first}
\DeclareNameAlias{author}{sortname}
\DeclareNameAlias{editor}{sortname}
\DeclareNameAlias{translator}{sortname}
\renewcommand*{\multinamedelim}{\addslash}
\renewcommand*{\finalnamedelim}{\multinamedelim}
\AtEveryBibitem{%
\clearfield{month}%
\ifentrytype{article}
{\clearfield{volume}
\clearfield{number}}
{}
}
\renewcommand*{\finentrypunct}{}
\renewcommand*{\labelnamepunct}{\addcolon\space}
\renewbibmacro*{publisher+location+date}{%
\setunit{\addcomma\space}%
\printlist{location}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{location+date}{%
\setunit{\addcomma\space}%
\printlist{location}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{journal+issuetitle}{%
\usebibmacro{journal}%
\setunit*{\addspace}%
\iffieldundef{series}
{}
{\newunit
\printfield{series}%
\setunit{\addspace}}%
\usebibmacro{volume+number+eid}%
\setunit{\addcomma\space}%
\usebibmacro{issue+date}%
\setunit{\addcolon\space}%
\usebibmacro{issue}%
\newunit}
\renewbibmacro*{issue+date}{%
\printfield{issue}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{series+number}{%
\iffieldundef{series}
{}
{\printtext[parens]{%
\printfield{series}%
\setunit*{\addspace}%
\printfield{number}}}}
\begin{document}
Some text\autocite{BlaBla:1999,cicero,wilde,coleridge}
\printbibliography
\end{document}

\usepackage[style = numeric,backend=biber,autocite = superscript]{biblatex}and inside the text useThis is a super nice example\autocite{BlaBla:1999}. After this we can modify your bibliography output. – Marco Daniel Feb 09 '14 at 10:44geschichtsfrklstyle has not been updated since 2012, andbiblatexhas changed quite a bit since then. Seeing that you are not too fussed about in text citations (the hard part to implement), you might want to modifynumeric(as Marco Daniel suggested). Just explain what you would like to achieve (i.e. give the general format and maybe one or two real life examples and their expected output). – moewe Feb 09 '14 at 11:19