As Choppernut says above,
Simbrief is a very good flightplaning tool. It will offer you what it thinks are the best departure and arrival options (Dep runway/SID and arrival runway/STAR). These can all be manually modified. For flightplanning into, out of or within the USA, it is customary to include a nominated SID or STAR. This forms part of your flight plan. ATC will still issue the SID/STAR verbally (usually). If a STAR is not issued verbally you are expected to fly your flight planned arrival (assuming of course it is still for the originally planned runway).
VATPAC is an excellent website for Australian online procedures and resources. Got to
VATPAC then click on Explore tools then ATC Assist. I would recommend booking the page for future reference.
A direct link is here:
ATC Tools