Is redis needed for this?

Hi,

I am making a site in Flask which is similar to Ebay in a lot of ways.

I am wondering if it is recommended to have a queue system like redis in place for when an item is posted on the site, because the following tasks needs to happen:

Resize Image

Generate SEO tags

Generate an invoice

Send email

Is it recommended to have something like redis running to handle this stuff in a queue, or should I just generate it on the fly when the item is posted to the site? Not sure if this system is required or infact overkill.

Thanks