Hello again,
a few month and a few steps later.
Hopefully you can help me again.
My setup today:
My VM network settings look like this
My openwrt settings look like this:
network.loopback=interface
network.loopback.ifname='lo'
network.loopback.proto='static'
network.loopback.ipaddr='127.0.0.1'
network.loopback.netmask='255.0.0.0'
network.globals=globals
network.globals.ula_prefix='****::/48'
network.mng=interface
network.mng.type='bridge'
network.mng.proto='static'
network.mng.netmask='255.255.255.0'
network.mng.ifname='eth0'
network.mng.ipaddr='10.0.1.11'
network.wan=interface
network.wan.ifname='eth0.2'
network.wan.force_link='1'
network.wan.proto='dhcp'
network.wan.peerdns='0'
network.wan.dns='103.86.96.100' '103.86.99.100'
network.nordvpntun=interface
network.nordvpntun.proto='none'
network.nordvpntun.ifname='tun0'
I am struggling to understand how to set up the vlan with the one physical eth port on my server and would like to have a 101 guide.
Or just some kind words that i am not an complete idiot since its not easy to get this whole networking thing 
How do do i have to set up the switch and how do i have to set up openwrt to get things going?
Thanks for your time and your support.