Start w/observations: position, color, activity, O2 sat, what equipment, what drips, IV site(s). Resp status and support. Then tactile: gently place your hand on their back to count resp; place stethoscope to listen for breath sounds, move to front (preferably w/o waking the kiddo) listen for murmurs, count heart rate, listen for bowel sounds; feel fontanels and sutures, pulses. Turn the baby over, slip the measuring tape under the baby; take the abd girth @ the umbilicus, that's standard. Check NG tube placement, note measurement. Diaper change, skin integrity. Close your diaper up completely to prevent urine evaporation. Change your gloves. If there's a bath, give it now. Dry and re-diaper. Meds and feeding.
Until you develop a routine, it will take take as long as it takes. You will speed up as time goes on. If you have a routine, you will not miss stuff, and have to bother the baby again. If any of your findings are not normal, it will slow you down--a lot.
I wish you all the best. I know you will do well.