Pilot departing VNC; a non-towered airport; reported experiencing an NMAC on departure; and expressed concern that VNC needs a Tower to enhance safe operations.

Narrative

I; Pilot in Command; a private pilot with an instrument rating was conducting commercial pilot training with my Instructor; a CFII with multi engine rating. We had completed a series of circuits in the traffic pattern at VNC which is a non ATC controlled field. On the last circuit we made a full stop landing and taxied back to the approach end of the active runway. While holding short of the entrance to the active runway; we heard the only other aircraft in the pattern make their midfield downwind leg call out. At this point; my instructor and I made the decision to enter the runway and depart. As we advanced past the hold short taxiway markings; we heard the same aircraft make a base-to-final call and I observed the aircraft on short final to the runway. I applied the brakes and stopped the aircraft approximately 7-8 feet past the hold short line and 40 to 50 feet from the runway boundary. The aircraft then passed overhead to land with approximately 100 feet horizontal and 200 feet vertical separation. The other aircraft was another high wing light single engine. The other aircraft did not make any indication over the CTAF frequency that they would be making a short approach or flying any other type of non standard traffic pattern. I think there are several contributing factors to this occurrence. My instructor and I should have had a higher degree of situational awareness prior to making the decision to depart and entering the runway threshold; whether that be by visual identification of the other aircraft in the pattern or through use of ADS-B. Additionally; I think it is imperative that aircraft flying at a non towered airport that intend to fly an non-standard traffic pattern properly announce their intentions on the common frequency; as we likely would not have made the decision to depart knowing that.Outside of the actions of either pilot; the VNC airport is completely in need of air traffic control; even if it is a non radar VFR tower. The traffic at VNC during the day can get out of control with GA and flight training aircraft; with safety events becoming often. The frequent jet traffic flying instrument approaches with a multitude of VFR aircraft in the traffic pattern only complicates the issue.