Welcome to the Q&A Forum

Hello Everyone. I recently started getting interested in SEO. I'm the owner os a small mens underwear company we limited staff, limited resources, etc. well I'm sure most of you know the drill. I have read countless articles, guides, starting with the ones here at Moz but when it comes to actually starting to fix the problems I have I have NO IDEA where to start. it is discouraging and to be honest frighting. I know right now my competitors are getting ahead of my while I just stare at my screen thinking where do I start? Do I fix loading speed?Do I repalce the entire content of my site? mostly category texts, product descriptions, do I add Atl text to all my images?
how do I even start building links when it seem the only strategy is to send an email to a related site to link to us? any way. Most of you here are SEO experts and small business owners I would greatly appreciate if you point me in teh right direction, like a 1, 2 ,3 ....type of thing. I might be asking to much but after thinking about it I decided to post something here.