1. Did Christ Jesus-our Savior-partake human(our) flesh and blood as in Hebrew 1:16?
I think you mean Hebrews 2:14, which says, 'Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same....' This verse seems to speak for itself. It states plainly that Jesus Christ participated in the very same flesh and blood as all the rest of us. That is the only experience that could have qualified Him as a Son of Adam.
2.Who or what was Christ before He entered this world or before the World began?(John17:5)
Before Jesus Christ entered the world through the human birth process, He was the eternal Spirit (God, Creator, Father, LORD, etc.) which He continues to be today and forever.
3. Is Jesus the 'Holy Spirit' or 'baptizer with the Holy Spirit and fire'?(John 16:12-15)
Jesus is both the Holy Spirit and the One who baptizes others with the Spirit. In Matthew 3:1, John says of Jesus, 'He will baptize you with the Holy Spirit and fire.' But in Ephesians 3:16-17 Paul writes, 'To be strengthened with might through His Spirit in the inner man, that Christ may dwell in your hearts....' This tells us that when the Spirit is strengthening us in the inner man, Christ is dwelling in us. The Holy Spirit is Jesus Christ.