"Where You go, I'll go" is more than physically going into a place where the Lord sends you. It's going to a place where the Lord spent most of His time: Before the Father! Jesus stole moments away from the crowds to receive instruction, direction, revelation and strength during His walk in ministry on the earth. We also must go into His Presence to receive the same.
"...I tell you the truth, the Son can do nothing by himself; he can do only what he sees his Father doing, because whatever the Father does the Son also does." ~ John 5:19
"What you say, I'll say Lord" will require us to speak those things we receive in our prayer time with the Lord. Many times these are words of encouragement, prophecy and declarations but there are also words of warning and correction in which many will refrain from speaking forth due to fear. Jesus only spoke those things He heard the Father say and He didn't refrain from speaking them regardless if they pleased the people. As we all know not many were. He stood to be persecuted for the things He spoke because they were harsh to the flesh of man: "When His disciple heard this, many of them said, This is a hard and difficult and strange saying (an offensive and unbearable message)" (John 6:60a)
...and that I do nothing on my own but speak just what the Father has taught me."~ John 8:28b
"What you pray, I'll pray" is praying the will of the Father and not ours. It's coming into a posture of silence and inclining our ears to His Heart. As we receive the burden, we cry out - interceding for those very things that He cries out for. It can be a person, a situation, a nation, a particular sin that we ourself are struggling with, the coldness of the hearts of many, for the lost, and overall His Bride. His desire is to return ALL unto Himself and as we pray what He prays, there is a release of Heaven on earth.
"He went away a second time and prayed, "My Father, if it is not possible for this cup to be taken away unless I drink it, may your will be done." ~ Matthew 26:42
"Thy kingdom come. Thy will be done in earth, as [it is] in heaven." ~ Matthew 6:10
"How can I expect to walk without You" becomes a declaration as Moses' "...If your Presence does not go with us, do not send us up from here." (Exodus 33:15) We CANNOT proceed without the Spirit of God for He is our guide and the One Who empowers us to fulfill what the Father has spoken for us to do. Without the Spirit of Life, all that's left is the "flesh" of death. We must go not in our own power, might or name, "..., but by my Spirit,' says the LORD Almighty" (Zechariah 4:6b)
It is only in the secret chambers of prayer and intercession where we find ALL we need to "go, speak, and do - in the Power of the Lord. It is in this place where: "The Spirit of the LORD will rest on him--the Spirit of wisdom and of understanding, the Spirit of counsel and of power, the Spirit of knowledge and of the fear of the LORD--Isaiah 11:2
Now we are able to sing "Where You, I'll go...What You say, I'll say Lord,...What You pray, I'll pray....