Blog design help!

Because I'm still so new to this I would LOVE some help with the design and layout of this blog. I should probably watch some YouTube videos or have my 13 year old do it ;-) How to add pictures the right way, etc. There are so many great blogs that I follow that look so professional I really need help so that mine doesn't stay looking like a 12 year old girl did it (that was the last time I remember being really creative) So...tips & advice are totally welcome!