It would be very difficult for someone to tell you exactly what you need to buy, since these soft sided pools have been changing over the last few years, and there is more than one manufacturer. Intex has become synonymous with soft sided pool, much like kleenex and tissue, so you may see some references to an intex pool when they actually have a Summer Escapes, or a Pro Series. Some of the parts are interchangeable but not all.
I looked up the pool you mentioned and it comes with a through the wall skimmer/filter/pump combo that Intex brand pools do not have. You could replace this with a standard through the wall skimmer, a filter of your choice (I prefer sand), and a 1 hp 2 speed pump. Some of our members have been able to remove the filter/pump portion from the stock skimmer and just add plumbing, pump, and filter. If you want to try this and are unsure how to proceed take several close up pictures of the skimmer pump combo and post them here.
Measure the diameter of the inlet and outlet fixtures. If they are 1 1/2" you should be able to use standard plumbing fixtures. If they are 1 1/4" you may need to make some modifications.