<p>Airborne Wind Energy is an emerging technology that harvests wind energy with flight systems connected via a tether to a generator at the ground. A flying wing promises a high energy output during the power generation phase due to its aerodynamic efficiency. Besides, the flying wing can take off vertically in a tailsitter configuration for operation within a limited space. Yet not part of the generation phase, the starting procedure raises main challenges to the flight system in general but especially to a flying wing. A fast transition from hover to crosswind flight is required under minimal power consumption and high wind robustness, while considering the tether connection and the limited flight envelope of the flying wing in hover state. This paper conducts a detailed analysis of the stationary trim states of the flying wing during the transition and introduces a lateral yaw-roll transition to allow for a flight within the flight envelope in both high and low wind conditions. Based on the trim states, different options for the starting procedure are evaluated and an appropriate path is selected that entails a straight-lined transition segment to enter forward flight, followed by curved flight to build up tether tension and to navigate into the power-generation zone. The first part of this transition from hover to horizontal forward flight is demonstrated in the simulation to verify the selected flight path.</p>