Horizontal lines can be created using HTML or markdown coding. 

~~~~
---
Or
<hr>
~~~~

Aligning images 
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<div class="pull-left">img  URL here</div>
<div class="pull-right">img  URL here</div>

<center>![](Img URL)</center>
~~~~

Not possible for different fonts. The font given is one of the most legible anyway. :)


I use a mixture of both markdown and HTML to format my posts. Here's a great markdown reference. https://en.support.wordpress.com/markdown-quick-reference/