First of course, you need Lord Jesus in your life. Romans 8:14
John 3:16
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

For as many as are led by the Spirit of God, they are the sons of God.

What did Jesus do when he went into the wilderness to be tempted of the devil.
He spoke the word of God.

Matthew 4:3 -And when the tempter came to him, he said, If thou be the Son of God, command that these stones be made bread.
Matthew 4:4- But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.

Yes,we need the word of God.The bible says-James 4:7-Submit yourselves therefore to God. Resist the devil, and he will flee from you.
Christains-Hebrews 4:12-For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
When temptation comes, You need the word of God.
For fear-2 Timothy 1:7 -For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.

For sexual immorality- 1 Corinthians 6:18
Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
if you feel guilt over past sins- Romans 8:1
There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit

For pride-1 Peter 5:5 -Likewise, ye younger, submit yourselves unto the elder. Yea, all of you be subject one to another, and be clothed with humility: for God resisteth the proud, and giveth grace to the humble.
If you get distracted -1 Peter 5:8 -Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour:
If you come under attack Romans 8
37But in all these things we overwhelmingly conquer through Him who loved us. 38For I am convinced that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers, 39nor height, nor depth, nor any other created thing, will be able to separate us from the love of God, which is in Christ Jesus our Lord.
You can ask God Matthew 7:7
Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you:
If you feel doubt -Matthew 21:21 -Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done
If you feel discouraged-Philippians 4:13 -I can do all things through Christ which strengtheneth me.We can resist temptation.
The bible says- 1 Corinthians 10:13 –There hath no temptation taken you but such as is common to man: but God is faithful, who will not suffer you to be tempted above that ye are able; but will with the temptation also make a way to escape, that ye may be able to bear it.

Ok. But i dont know the means.

What do you mean by you dont know the means