What is the difference between a Non O-A and Non O visa, and how can I extend my Non O visa in Thailand?

Your Marriage certificate needs to be apostilled.

here’s the link 9/Legalisation_info_June_2018.pdf

You don't need the money. Your 90 day nonO ist single entry, when you arrive in Thailand you go to the Immigration and you apply for a 1 year extension as a dependent of a person (your husband) you need only your husband passport and your certificate of marriage.

Your husband gets stamped in for a year when he arrives, you get stamped in for 90 days, and when that 90 days runs down you and he go to the immigration office with documentation to get you an extension of stay that matches his entry stamp based on you being the spouse of a foreigner who has a long stay visa (trailing spouse clause)

if you two were married in the UK you'll need to get your marriage certificate certified FIRST before you wing your way here as you'll need that to get your extension. Google certify UK marriage certificate thailand and it will tell you how it's done. if you don't do it before you come here you're gonna be mailing it back to get it done before you can get your extension that matches your husbands entry stamp