Welcome! For begginners and depending how many marbles to sort, a good place to start is separate glass marbles from stone/steel etc. Generic glass marbles (single color transparent or opaque) are easy to separate, followed by generic catseyes. What's left over is where it gets interesting...time consuming but rewarding.
Worth noting: not everyone agrees on names. Some names even vary geographically, some ID's change as more info comes to light, and some info published in books is arguably incorrect, so I take most with a grain of salt and try not to split hairs.
With a single group shot most informed collectors will have a decent idea of what you've got and what's worth a closer look.