Matthew 11:28 Come unto me, all ye that labour and are heavy laden, and I will give you rest.
John 15:4-5
4 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.
5 I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
You can just do it and you will be a Christian.
If you want to actually try to begin to understand it you must study scripture and pray. A lot.
This would be a good prayer to start;
Ephesians 1:17-19
17 That the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom and revelation in the knowledge of him:
18 The eyes of your understanding being enlightened; that ye may know what is the hope of his calling, and what the riches of the glory of his inheritance in the saints,
19 And what is the exceeding greatness of his power to us-ward who believe, according to the working of his mighty power,