Should new believers read the whole Bible? Yes, eventually. But start with the Gospel of John (written for the purpose of producing faith), then the rest of the NT. Read Psalms and Proverbs for wisdom/worship. Genesis for foundations. Don't start at Genesis 1 and try to plow through — you'll bog down in Leviticus. A reading plan helps maintain consistency.

Gospel of John: written "so that you may believe" (John 20:31) — designed for new/potential believers. Then other Gospels, Acts, epistles. Psalms and Proverbs are accessible and practical. Genesis provides foundational theology. Leviticus/Numbers are important but not where to start. A reading plan (many free apps available) provides structure and accountability.