Hmm, well, I would say it seems daunting at first, everything will look a little complicated, especially when you list your first ever item! Don't worry about spending plenty of time reading through all your options and tools, it's all there to help you sell.
I would also say, be confident! Don't be scared to blow your own trumpet in an item description or scared of pricing your items too high. Good photos also go a long way to helping with success, and advertising on social media is extremely useful.
Don't be disheartened - I still have more bad days than good selling wise and I've been doing it for nearly 10 years. You might not always get the attention you want for something you've made, but that's ok, it's all a learning curve!
I hope this helps a little? Don't be afraid to ask more questions if you need to