Parts and Styles of a Church.

From the early days of religion, there has always been a place to worship, a meeting of people and eventually a church as a place to help spread the word of the Lord God and Jesus. The styles have changed for all over the ages, firstly a gathering. a meeting place, a wooden church, Saxon Church (up to A.D. 1066), Norman (1066-1090, 1185-1200), Early English, (1200-1280), Transitional 1, (1280-1300) Decorated, (1300-1385) Transitional 2, (1385-1400), Perpendicular (1400-1500), Renaissance, Tudor, (1500-1540), Gothic, Medieval, after Reformation. There are the building materials that some have been dependent on materials such as Wood, Rubble, Norfolk Flint, Ashlar.
Shaping such as Zig-Zag, Quatre-foil and circular.
These are a few things to look out for.

Windows. From the 7th century Saxon to the modern day a bit like houses, churches went through their own styles over the ages, With house, windows changed between, nothing, just open spaces, then wooden, then Crittall windows, UPVC windows etc.

Roofs. Open timber roofs of low pitch and of the hammer beam construction abound; they were often richly ornamented with carved figures of angels, and with pierced tracery, many examples are in Norfolk.

Saxon triangular-headed form.
Simple window form.

Medieval Style Tower Window, as with deserted ruin Godwick

Saxon round-headed form.
Simple window form. (note arch)

Early English Lancet, the first arrival of pointed Gothic form.

The typical "Y" traceried form.
As at Binham that is now bricked. shown Amner, Saint Mary's.
Decorative styles reticulated form.

Decorative "Butterfly motif form.
Like that of Kettlestone.

Curvilinear window.

Carved heads with closed eyes, shrunken lips and a "death-like appearance" 
Facing north - traditionally the dark or ‘devil’s side’ of the church - they could be figures of protection.
Blocked up doors on North side of the church they're possibly at times, called Devil's Doors,as the north side of a church was considered to be the devil's side of the church, also I burials that side were usually contained witches, unbaptised children etc.
Scissor Beam Style roof.
As that of Wissonsett.

Scissor Beam style Barton Bendish

Braced Arch with Purlin,

Trussed Rafter Roof.
As Stow Bardolph.

Rood Screen Decoration
 Rood Screen Anmer
Remnant of a Sacrement house. or
ambry (or aumbry), a small recess that acts as a cupboard near the altar, used for storing the chalice.

Banner Stave Locker.
Used in the Middle Ages to hold the handles of banners used in
processions on Feast days and holidays.
Ring of Thorns.
Holy Water Stoup
 Norman slit interior form.
Originally made for "Oiled Linen or Parchment, glass coming later.
Norman slit exterior form.
Originally made for "Oiled Linen or Parchment, glass coming later.
Early English lancets joined.

Simple plate tracery form.
Binham Priory.

Perpendicular Type
West Window Saint Nicholas Chapel, King's Lynn.
Perpendicular Type
West Window Saint Nicholas Chapel, King's Lynn.
Collar Brace style.
Look for corbels at the bottom of the Wall Post. Usually wooden planked.

King Post style.
like a Scissor Beam, but with added downwards King Post and horizontal Tie Beam
Arch Bracing, South Acre.

King Pin
with tie beam.

Ridge Beam, Hammer Beam
(upright Purlin)
Spandrel and wall plate.
Ridge Beam, Hammer Beam, upright Purlin, spandrels.
Saint Leonards Mundford.
Hammer Beam with Collar Beam
Double Hammer Beam
Piscina, both singular and double.
Monument showing deceased child.
The type of tower is called a Ziggurat, based on Mesopotamian structures, I read up on it a while back, I can't remember if it's the only one in the UK though, there's certainly not many. (Usually each layer has a prayer room) , in Burgh Saint Peter's case, the rooms are set as room for monuments, bells, vestry, etc.