Welcome to the Q&A Forum

QUESTION 1:

Setup a catchall .htaccess 301 redirect to point http:// to https://

(So the age of your page is transferred to the https:// pages)

QUESTION 2:

In short: No

But

It wouldn't hurt to make sure you have a canonical tag on all your pages pointing to the preferred url structure

For example these 2 pages load 1 page (and both URLs work):

http://singlespeedbikes.co/abacabb-2-0
http://singlespeedbikes.co/abacabb-2-0/

But the cannonical tag on this page tells Google which URL it should index to avoid confusion with duplicate content etc, example:

<link href="[http://singlespeedbikes.co/abacabb-2-0](view-source:http://singlespeedbikes.co/abacabb-2-0)" rel="<a class="attribute-value">canonical</a>" /> 

It kind of makes sense to include it on 1 account. I notice Google is trying to get users to consolidate google accounts now (if you have a few google accounts you'll notice the: what account do you want to login with option)

Definitely stick to 1 brand 1 Google account (for youtube and G+)

This works out well when using G+