install postgresql on opensuse 13.1 with osmosis .....

hello dear osm-experts

i am willing to install postgresql on opensuse 13.1 - well i want to combine it with osmosis

first question : do i have to make some checks - to get an overview on the ressources and the performance and space etc. etx.
note: i need to run postgresql with osmosis - so therefore i need some ressorces left.

just need your advice for the first test -

afterwards i am going to install postgresql
how to do that:
well i think never place something that is specific to my environment in system part. So if we want to create a native postgresql.service for systemd on our system _ we have to place it in /etc/systemd/system

is this correct?