to start with, i found the church on google maps, and took a screen shot of it, i then used this to produce a floor plan of it. we visitied this place aswell and took photo, using these i got a good idea of the height of certain areas.

to begin with i added a box, from this i extruded in all four directions, to form a cross shape, and the top part, i then extruded upwards.

i then used a cylinder with only 3 sides to form the roof, i then attached these to parts together, and this is the start of my church.