After your order is placed and your domain is pointed properly to your hosting, it typically takes about 5 min to issue and install your SSL Certificate.
Our Certs are from Popular cert distributors like Comodo and Thawte and are trusted in 99.9% of all browsers.
If you want to remove the non-secure lock from your website or are sending sensitive info like contact forms or an online store, then yes.
There are several. We offer our general PositiveSSL certs for our standard issued certs.