@ Trentonp sure
I'd suggest that we start with evidence that Jesus Christ, himself, existed. I have encountered a few who doubt this and it seems as good a spot of origin as any. I think that we'd both agree if he didn't exist then he couldn't have been resurrected?
My evidence for Christ's existence is as follows:
Biblical sources: The entire New Testament, especially the four Gospels. THey are important in that they reveal as much about Jesus Christ as we have about other ancient figures such as Alexander the Great. No written works by either figure are existent, but we do have testimony by those who knew them. I understand that the New Testament sources will be seen as biased by most. Christ was not only mentioned in the New Testament though.
Extra-Biblical sources:
Flavius Josephus (Jewish historian born 37AD)
"Now there was about this time, Jesus, a wise man, if it be lawful to call him a man, for he was a doer of wonderful works--a teacher of such men as receive the truth with pleasure. He drew over to him both many of the Jews, and many of the Gentiles.
"He was (the) Christ; and when Pilate, at the suggestion of the principal men amongst us, had condemned him to the cross, those who loved him at the first did not forsake him, for he appeared to them alive again the third day, as the divine prophets had foretold these and ten thousand other wonderful things concerning him; and the tribe of Christians, so named from him, are not extinct at this day" (Antiquities, XVIII, III).
This is a contested work because of the reference to Jesus as the Christ, and that he was resurrected. It does stand as an extra-Biblical mention of Christ's existence by a non-Christian within the generation after he was crucified. Josephus was not a witness to the fact, but had access to eye-witnesses.
Senator Cornelius Tacitus (112 A.D.) mentions Jesus Christ’s existence in his work and confirms the existence of Christians in Rome within a century of Christ’s death in his work "Annals".
Julius Africanus (writing about 221A.D.) quotes an earlier source (Thallus writing at around 52AD) that tries to explain away the darkness that came after Jesus was crucified:
"Thallus, in the third book of his histories, explains away the darkness as an eclipse of the sun--unreasonably, as it seems to me."
Basically, we have as much information from various sources as we have on any ancient figure. I think there is no reason to doubt the existence of Jesus Christ. We have sources mentioning him as early as 30 years after his death