Good decision to move to Wordpress, you won't regret the decision.
The best way to get started is to find a good video tutorial and then to get started on your site. I recommend this tutorial by wpsculptor because it covers just about everything you will need to get started.
You do not need to get into any development at this stage, nor do you need to understand the database structure or code. My advice is to stick to the basics (covered in the tutorial) until you have a good understanding of how to create a website using the build-in Wordpress functionality.