“The Church is... where the Lord is acknowledged, and where the Word is.” - The New Jerusalem and Its Heavenly Doctrine §242
Kempton New Church

Questions:

Who is Emanuel Swedenborg?

Emanuel Swedenborg (1688-1772) was first a scientist and then a theologian who lived in the eighteenth century. Swedenborg wrote,

The Lord's second coming is taking place by means of a man, to whom He has shown Himself in person, and whom He has filled with His spirit, so that he may teach the doctrines of the New Church, which come from the Lord through the Word.

Since the Lord cannot show Himself in person, as has just been demonstrated, and yet He predicted that He would come and found a New Church, which is the New Jerusalem, it follows that He will do this by means of a man, who can not only receive intellectually the doctrines of this church, but also publish them in print. I bear true witness that the Lord has shown Himself to me, His servant, and sent me to perform this function. After this He opened the sight of my spirit, thus admitting me to the spiritual world, and allowing me to see the heavens and the hells, and also to talk with angels and spirits; and this I have now been doing for many years without a break. Equally I assert that from the first day of my calling I have not received any instruction concerning the doctrines of that Church from any angel, but only from the Lord, while I was reading the Word. True Christian Religion §779

What is the New Church?

The New Church is a new Christianity based on the Old and New Testaments and the Heavenly Doctrine of the New Church (also known as the Writings) revealed through Emanuel Swedenborg. The New Church is founded on the belief that the Lord God Jesus Christ is the one God of Heaven and earth.

What is the Heavenly Doctrine of the New Church?

Through His servant Emanuel Swedenborg, the Lord has revealed how angels in heaven understand the Lord’s Word, according to its spiritual sense. The New Jerusalem, described in Revelation 21, symbolizes a new church that will be truly Christian. The books of the Heavenly Doctrine (also known as the Writings) reveal the inner or spiritual meaning of the Old and New Testaments; the nature of the spiritual world and the life after death; how the Trinity is united in the Lord Jesus Christ; the life of charity or love toward the neighbor, according to the Ten Commandments; the laws of the Divine Providence; the holiness and eternity of marriage; the nature of the last judgment; the inhabitants of some other planets; and many other wonderful things. Click here to see descriptions of some of the books of the Heavenly Doctrine.

What are the main differences between the New Church and other Christian churches?

A good answer to this question can be found here.