An eye catching cover and title that accurately reflect the story-line of your book are essential. One point to consider is that the cover must transmit information to the potential reader in seconds ... and this must be legible not only as a full high definition artwork but also as a very small thumbnail object for catalogue listing.
If you want to write successful fiction you need to have the right IDEA! You need to be INSPIRED, DETERMINED, ENERGIZED and AMBITIOUS. You will, without doubt, become 'drained' and 'stressed' if you attempt to tackle such a monumental task without the security of these three essential creative foundations to lean upon. An unfortunate fact is that 97% of writers never complete their book or novel project ...!