Newbie with a question

So i set up a 55 gal (48x12x18) tank this past saturday. I figured i would start small for the initial cycle then add everything else right before i stocked the tank. What i mean is i bought 1 HoB filter, gravel, and 1 small lava rock initially. Well this got me to thinking and I'm guessing i really need to have my second filter in the tank during the cycle and possibly all the decor i plan to add later during this initial cycle. Is this correct that i should have everything in the tank for the initial cycle?