Start at the beginning, go lesson by lesson and as you do the Items on the to do list mark them off and go to the next lesson,if you get stuck there is a Need help bar at the top type in what you need help with and it will give you a list to choose from, if that doesn't help then come ask us a question would be glad to help, you have a great Idea just keep it rolling, here is training lesson 2 on content.
https://my.wealthyaffiliate.com/training/building-your-own-traffic-producing-website/building-out-your-website-theme

it is a bit over whelming but it gets better

Getting overwhelmed is common, but the community is here to help out! How far have you got in the lessons?

Go through the training videos and activities Kyle has provided us. As you go along, you will get more ideas about the route you want to take? Have you chosen a niche?