I've never seen a contemporary plan of the battle nor a later day reconstruction of the terrain and deployment. At a glance there does not seem to be information at all about the fighting at Wolgast.
The best map I've found of the area is this one made by Swedish military engineers in 1805:
Keep in mind that the terrain changed a fair bit between 1628 and 1805, the town grew in size while the mashes were drained to create usable land.
The Danish position was to the west of Wolgast and took the shape of a "Hornwork" placed to defend the passable gap in the mashes. (Christian relied on the mashes and possibly the sea to protect his flanks)
Wallenstein bomarded the position with limited effect though some stored powder did blow up, what sealed the fate of Christians little army was that the Imperial scouts found a way to cross the marsh and turn the Danish flank while the main bdy of the Imperial army made a frontal attack. With at best 4000-5000 men of very mixed quality Christian would have been hard pressed even in the best of circumstances to withstand such an attack.
Christians problem was that he did not have the troops to guard against a flank attack while his forced lacked the cohesion to face such an event without falling apart.
of 
