If you are not 100% certain that you are going to Heaven because of what Jesus Christ personally provided for you through His work on the cross, or if you are not 100% assured that you are eternally secure based on the promises of God, we suggest that you better understand the Gospel.
You can also watch/listen online, or download, this "Good News" with the messages:
It Is Finished - (MP3 Online, MP3 Download, Video)
The Wonder of Calvary - (MP3 Online, MP3 Download)
Or by navigating to the series The Gospel, Plain and Simple
If you are a believer in Jesus Christ, and are serious about studying the Bible and are wondering where to begin, we suggest you listen to the following series, in order:
We are justified by grace alone, through faith alone, in Jesus Christ alone, as presented in the Gospel. These three series underscore that we live our Christian lives in the same manner, and can be used to help you grow in spiritual truth. The messages will help establish you in some of the most basic and important doctrines of the Christian faith, providing you with the kind of solid foundation that is essential for sound Christian growth.
All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work.
2 Tim 3:16-17