12 Now at this time Jesus went off to the mountain to pray, and He spent the whole night in prayer to God. 13 When day came, He called His disciples and selected twelve of them, whom He also named apostles (special messengers, personally chosen representatives): source
I am unaware of anything further in Scripture to tell me what Yeshua and The Father talked about on this occasion, but verse 12 tells me it was an all-night conversation. Considering what He did the next day (verse 13), I think they discussed the calling of His Disciples. Perhaps they discussed Peter and his quick-temper and that in time when the Holy Spirit came to live within him, he would be a devoted and powerful witness. Perhaps they spoke of Judas and his ambitions. Perhaps they spoke of each and every one of the Twelve and by morning’s light, JESUS knew exactly the course before Him and He did it. Always He did the Father’s Will.