OpenVPN client setup

I have been following this tutorial –Howto Configure OpenVPN Server-Client on Ubuntu 15.04–to set up OpenVPN on my Ubuntu 15.04 VM. I have followed it through and through,and am kind of stuck with the client config file.

Here is the client.conf file given in the example:

dev tunproto udp# IP and Port of remote host with OpenVPN serverremote 111.222.333.444 1194resolv-retry infiniteca /etc/openvpn/keys/ca.crtcert /etc/openvpn/keys/client.crtkey /etc/openvpn/keys/client.keytls-clienttls-auth /etc/openvpn/keys/ta.key 1auth SHA1cipher BF-CBCremote-cert-tls servercomp-lzopersist-keypersist-tunstatus openvpn-status.loglog /var/log/openvpn.logverb 3mute 20

So I am guessing remote IP would be the public IP of my server and that I would need to forward port 1194 on my router. However where I define the ca, cert and key in the conf file, if I was using this on an Android device would I need to change the path to reflect where these files are on the Android device or is the example given correct?

I will be generating the client key to be used on both Android and iOS devices using the OpenVPN client. Would this also work on Windows?