Not sure what you mean by edit fullwidth wrap & save at least once. How & what am I supposed to edit?
when you insert a new fullwidth wrap, please edit the fullwidth wrap, save it at least once(see screenshot: https://www.dropbox.com/s/tj9gvsyxoyj61m5/QQ20150908-1.jpg?dl=0). Or the new fullwidth wrap will not be shown. For your home page, it isn’t new fullwidth wrap, so you could ignore it.
How do I get the Site Name & Header to show? They’re both in there but nothing shows.
Where is “Site Name & Header” you talked about? Could you please paste a screenshot?
Also, top of the menu bar still shows “Aside”. How do I get this to change?
Please login wp-admin, go to Aside / General Settings / , upload custom logo. (see screenshot: https://www.dropbox.com/s/7y4cajfha4pvs0m/QQ20150908-2.jpg?dl=0)
On the front page portfolio brick, is there a way to select which of the portfolio posts is shown rather than random?
There is not order option. I suggest you refer the video guide for brick list: