Help with starting a Reef tank

Hello I am new here. I hope I have this in the right part of the message board.

If this needs to be moved I am sorry! I looked for where to put it :(



I just started my 36 gal Bow front yesterday. So far I have 10 lbs. of live rock and live sand in it. I am planning on adding another 40-50 lbs of live rock (or dry rock) it before starting to add reef frags.



My question is.....



With that much live rock (if it fits and all is well) do I need to look at setting up a sump and protein skimmer? and getting rid of my sit on top filter.



OR



Keep the sit on top filter and purchase a sit on top protein skimmer...



Any advice for a beginner is much appreciated!