I am struggling putting the bibliography in the required format. More precisely, a MWE of my code is
\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\PassOptionsToPackage{hyphens}{url}
\usepackage[hidelinks]{hyperref}
\usepackage[ngerman]{babel}
\usepackage[
backend=biber,
style=authoryear,
citestyle=authoryear,
]{biblatex}
\addbibresource{test.bib}
\begin{filecontents}{test.bib}
@Book{Behrbohm2012,
author = {Behrbohm, Hans and Kaschke, Oliver and Nawka, Tadeus},
title = {Kurzlehrbuch Hals-Nasen-Ohren-Heil\-kunde},
year = {2012},
edition = {2. Auflage},
publisher = {Thieme},
location = {Stuttgart},
}
@WWW{VisuellesDenken,
author = {Fritsche, Olaf},
title = {Visuelles Denken},
year = {2018},
url = {http://www.visuelles-denken.de},
urldate = {2018-04-08},
}
\end{filecontents}
\renewcommand{\labelnamepunct}{\addcolon\space}
\DeclareNameAlias{sortname}{last-first}
\DeclareNameAlias{author}{sortname}
\DeclareNameAlias{editor}{sortname}
\DeclareNameAlias{translator}{sortname}
\renewcommand*{\multinamedelim}{\addnbthinspace\slash\addthinspace}
\renewcommand*{\finalnamedelim}{\multinamedelim}
\AtEveryBibitem{%
\clearfield{month}%
\ifentrytype{article}
{\clearfield{volume}
\clearfield{number}}
{}
}
\renewbibmacro*{publisher+location+date}{%
\setunit{\addcomma\space}
\printlist{publisher}
\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}}}}
\setlength{\bibhang}{0pt}
\newcommand\blfootnote[1]{%
\begingroup
\renewcommand\thefootnote{}\footnote{#1}%
\addtocounter{footnote}{-1}%
\endgroup
}
\DeclareFieldFormat[article]{title}{{#1}}
\DeclareFieldFormat[thesis]{title}{{#1}}
\setlength{\parindent}{0pt}
\DeclareFieldFormat{url}{\url{#1}}
\setlength{\bibitemsep}{\baselineskip}
\expandafter\def\expandafter\UrlBreaks\expandafter{\UrlBreaks% save the current one
\do\a\do\b\do\c\do\d\do\e\do\f\do\g\do\h\do\i\do\j%
\do\k\do\l\do\m\do\n\do\o\do\p\do\q\do\r\do\s\do\t%
\do\u\do\v\do\w\do\x\do\y\do\z\do\A\do\B\do\C\do\D%
\do\E\do\F\do\G\do\H\do\I\do\J\do\K\do\L\do\M\do\N%
\do\O\do\P\do\Q\do\R\do\S\do\T\do\U\do\V\do\W\do\X%
\do\Y\do\Z}
%\DefineBibliographyStrings{german}{%
% urlseen = {},
%}
\DeclareFieldFormat{urldate}{(Stand: #1)}
\renewcommand*{\nameyeardelim}{\addcomma\space}
\begin{document}
\nocite{*}
\printbibliography
\end{document}
This produces
Behrbohm, Hans / Kaschke, Oliver / Nawka, Tadeus (2012): Kurzlehrbuch Hals- Nasen-Ohren-Heilkunde. 2. Auflage, Thieme, Stuttgart.
Fritsche, Olaf (2018): Visuelles Denken. http://www.visuelles-denken.de (Stand: 08. 04. 2018).
But what I am after is
Behrbohm, Hans / Kaschke, Oliver / Nawka, Tadeus (2012): Kurzlehrbuch Hals- Nasen-Ohren-Heilkunde, 2. Auflage, Thieme, Stuttgart.
Fritsche, Olaf (2018): Visuelles Denken, (http://www.visuelles-denken.de; Stand: 08. 04. 2018).
Thanks for your help.

\renewcommand*{\newunitpunct}{\addcomma\space}should help with the full stop vs comma issue. – moewe Sep 29 '18 at 07:57biblatex(check your.logfile to find out, or report the Biber version) are you using? – moewe Sep 29 '18 at 08:00biblatexand Biber must be updated at the same time and that you should not update packages from CTAN manually. You should use the facilities provided by your TeX distribution.) – moewe Sep 29 '18 at 08:02