1  "Do not let your hearts be troubled. Trust in God; trust also in me.
2  In my Father's house are many rooms; if it were not so, I would have told you. I am going there to prepare a place for you.
3  And if I go and prepare a place for you, I will come back and take you to be with me that you also may be where I am.
4  You know the way to the place where I am going."
5  Thomas said to him, "Lord, we don't know where you are going, so how can we know the way?"
6  Jesus answered, "I am the way and the truth and the life. No one comes to the Father except through me.
7  If you really knew me, you would know my Father as well. From now on, you do know him and have seen him."
8  Philip said, "Lord, show us the Father and that will be enough for us."
9  Jesus answered: "Don't you know me, Philip, even after I have been among you such a long time? Anyone who has seen me has seen the Father. How can you say, 'Show us the Father'?
10  Don't you believe that I am in the Father, and that the Father is in me? The words I say to you are not just my own. Rather, it is the Father, living in me, who is doing his work.
11  Believe me when I say that I am in the Father and the Father is in me; or at least believe on the evidence of the miracles themselves.
12  I tell you the truth, anyone who has faith in me will do what I have been doing. He will do even greater things than these, because I am going to the Father.
13  And I will do whatever you ask in my name, so that the Son may bring glory to the Father.
14  You may ask me for anything in my name, and I will do it.
15  "If you love me, you will obey what I command.
16  And I will ask the Father, and he will give you another Counselor to be with you forever--
17  the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you.
18  I will not leave you as orphans; I will come to you.
19  Before long, the world will not see me anymore, but you will see me. Because I live, you also will live.
20  On that day you will realize that I am in my Father, and you are in me, and I am in you.
21  Whoever has my commands and obeys them, he is the one who loves me. He who loves me will be loved by my Father, and I too will love him and show myself to him."
22  Then Judas (not Judas Iscariot) said, "But, Lord, why do you intend to show yourself to us and not to the world?"
23  Jesus replied, "If anyone loves me, he will obey my teaching. My Father will love him, and we will come to him and make our home with him.
24  He who does not love me will not obey my teaching. These words you hear are not my own; they belong to the Father who sent me.
25  "All this I have spoken while still with you.
26  But the Counselor, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you.

1.  Is the Holy Spirit a person or a force according to this text?
 
It uses the pronoun "him" and "he" in verse 17.

2.  Who is the Holy Spirit?  Where did he come from?

Jesus said after He was gone, the Holy Spirit would replace his physical presence and be a permanent counselor.

3.  What's His job?

Spirit of Truth. Guide.  He helps us discern right from wrong.

4.  What's it like to rely on Him?

He is invisible.  Unsaved people can't tune Him in.  He's present in our thoughts.

5.  In the New Testament, the Holy Spirit comes at Pentecost in Acts 2:1-21.  Is the Holy Spirit mentioned in the Old Testament?  Is anything different?

In the Old Testament, the Holy Spirit comes and goes.

1 Sam 10:10
When they arrived at Gibeah, a procession of prophets met him; the Spirit of God came upon him in power, and he joined in their prophesying.

Psalm 51:11
Do not cast me from your presence or take your Holy Spirit from me.

 Now, after Pentecost, He's here permanently in believers as in John 14:16.

6.  Did Jesus command people to obey him?

Jesus never forced Himself on anyone.  What would happen if you tried to force someone to be a Christian?

7.  Verse 6 is very important. What does is say about other religions and getting to heaven?

8.  Is it necessary to ask God to be with us when we pray?

No.  To ask is to say you don't think He's there.  It would be better to pray for us to listen to God.  He's always there through the Holy Spirit as in verses. 16-17.