I did what you are planning to do. I didn't use a pressure tank and just connected a hose to the pump discharge. I used a 1/3 HP jet pump. I did this because I wanted to use a timer to operate the pump so it only came on for about 1/2 hour every 4 days - automatically. I guess I could have used a pressure tank too but it was simpler to just connect the hose to the pump. I didn't want the pump cycling on/off and wanted the pressure to operate the sprinkers (I usually have 2 or 3 connected).
I wired up 2 switches to operate the pump - one called Auto; one called On/Off. The On/Off allow me to turn the pump on when I want it on (I generally leave the hose connected to the pump) and in Auto the timer is used to obviously turn the pump on automatically. This is not fancy but works for me. If you just want to do it manually, just plug it in. Works for me as I only wanted to buy the pump and not the pump and tank combo.