You are welcome again:
1) Can't you surf on the internet?
What does that mean? Do you have access to the net or not? If the answer is yes, then you can use any browser available in the repository. If not you have to see if your network card is recognized or if it is correctly configured.
2)Once again I don't know much about networks. And also you should have to explain for what do you want your network. (the uses you plan for it).
3) A detail explanation should be too long for a forum, I am afraid.
In a nutshell (a big one):
Get the pkgsrc tarball (I would recommend beginning with exact the SAME VERSION as your pkgin repository to avoid problems)
> ftp
ftp://ftp.netbsd.org/pub/pkgsrc/pkgsrc-2015Q2/
> get pkgsrc-2015Q2.tar.xz
Once downloaded
> tar xzvf pkgsrc-2015Q2.tar.xz -C /usr
First I always install pkgfind:
> cd /usr/pkgsrc/pkgtools/pkgfind && sudo make install
Then you can search any package by name or description (see man pkgfind)
For example:
pkgfind firefox >>>> one answer will be www/firefox
so you go to /usr/pkgsrc/www/firefox and sudo make install to install firefox (needs time)
Nevertheless
http://netbsd.org/docs/pkgsrc/index.html It is a complete guide, maybe a bit confusing at the beginning.