Don`t worry. Marbles are a complex study, and all of us - no matter how long we`ve been at it - have something we have to learn and absorb nearly every day. It`s part of what is so engaging about marbles.
Don`t try to learn everything at first. It`ll never work! Pick a marble type/company in Steph`s Study Hall, or in the Archives, or in a book, get yourself a nice cup of coffee, put your marbles within easy reach, and just try to pick out your marbles that look closest to the examples shown.
Some marble companies have such distinct styles that they`re easier to start with, I think. When I first started studying machine-mades (I started by collecting the old Germans exclusively) I found that Akro and Peltier were the best for me to start with. Even just things like "only Akro made corkscrews" and "they never made flames;" with Peltier it was their distinctive feathered slags I first fell for, and looked for those.
Start small. And don`t worry about your learning curve. It was once the same for all of us!