Hi Ambistudent,
1) Pagination Option available in Main Settings, screenshot below
2) Paste your code in #AD4
3) You have to create a new user, you may not have to assign any posts to that author.
4) All shop plugins will work fine. Try WP estore but if you want woocommerce, EDD they will work fine too.
5) Try the following custom css in simple custom css plugin.
.js .selectnav {
font-weight: bold;
font-size: 16px;
}