Summary: Harry Ironside wrote a book called Full Assurance where he outlines the chief blessings gained the moment we trust Christ as our Savior. Here is a summary of that list. Full Credit goes to Danny Doege
53 Blessings That Happen To A Person After Believing On The Lord Jesus Christ
Full Credit goes to Danny Doege
When a Man, woman, boy, or girl, believes on the Lord Jesus Christ as their personal Savior the following list of attributes is granted to them instantly. The new Believer will not be aware of many of these things until gaining some spiritual maturity and growth in the word of God, but these  blessings are theirs regardless of their knowledge about them.
1.) Access to God’s Grace.....(Ephesians 2:8+18) For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: For through him we both have access by one Spirit unto the Father.
2.) We are adopted by God....(Ephesians 1:5) Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will, (Galatians 4:5) To redeem them that were under the law, that we might receive the adoption of sons.
3.) We get an Inheritance....(Ephesians 1:11) In whom also we have obtained an inheritance, being predestinated according to the purpose of him who worketh all things after the counsel of his own will:
4.) We are elected (saved)...(1 Peter 1:2) Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
5.) We become a child of God...(John 1:12) But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
6.) We get a heavenly citizenship...(2 Timothy 4:18) And the Lord shall deliver me from every evil work, and will preserve me unto his heavenly kingdom: to whom be glory for ever and ever. Amen.
7.) We become a servant....(Romans 6:22) But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life.
8.) We are heirs of God, joint heirs with Jesus...(Romans 8:17) And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together. (Galatians 3:29) And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.
9.) We become a new creature...(2 Corinthians 5:17) Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new. (Galatians 6:15) For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but a new creature.
10.) We become priests....(1 Peter 2:9) But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should show forth the praises of him who hath called you out of darkness into his marvellous light: (Revelation 1:6) And hath made us kings and priests unto God and his Father; to him be glory and dominion for ever and ever. Amen.
11.) We are reconciled to God....(Romans 5:10) For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.