Welcome Debbie.
A picture would help. Have you found a serial number on it? You said you were able to find a manual for your machine or did the manual come with it? I went to singerco.com and found a manual for a White 1260, but it is a free arm. I also found
http://www.sewretromachine.com/2016_10_01_archive.html that is a basic White machine with a "Majestic" badge.
If it is like the one at sewretromachine, there are several threads about various White machines with the "T-shirt" plate. I know after getting one of my Whites I found a thread about loading the bobbin here on QB that described it better than the manual. I know in your introduction here on QB that you have sewn for a number of years, but didn't mention which machine you learned on or are currently using. I think loading the bobbin on the older Whites takes just a tad to get used to. I have mainly sewn with class 15 type bobbins and so pinching the case was a tad different.
Janey - Neat people never make the exciting discoveries I do.