Howdy Jerry!
1) Yes, this is a builtin functionality of WooCommerce itself. You would go into WooCommerce and click “Add Order”.
2) If you have the correct PayPal account type. All WooTickets does is add WooCommerce products, and those products are your tickets. Thus, after the ticket/product is added to a users shopping cart WooCommerce handles it from there. You would want to consult with them if you have any questions about payment gateways like PayPal.
3) You can embed a buy it now button easily enough, and from there you can copy/paste any other info you want to appear on the page. Here is an example Add to Cart link:
<a href="./?add-to-cart=TICKETID" rel="nofollow" data-product_id="TICKETID" class="post-207 product type-product status-publish hentry first instock">Add to cart</a>
You made it perfectly clear. Please let me know if you have anymore questions. I might not be able to help much if your questions are about WooCommerce functionality, which is supported by a third party. But, I will do my best. Any WooTickets questions I can definitely assist you with. Thanks!
– Brook