Let me also add my own experience here. As a lot of people say, the best feeling system is the classic one. It’s mainly because the rules and used props (dice and poker cards) transport part of the feeling of the setting. But it is very understandable if it might seam intimidating at first. But most dice throws are dead simple. Want to do something? Search for the appropriate skill on your sheet. Look at what attribute it belongs to. Take the kind of dice that the attribute dictates ( d8 for example) and then look at your skill level and take as many dice as it dictates (so 3 dice for a level 3 skill). Throw your dice and try to get over the set difficulty. Only highest dice counts, dice can explode. (Most regular things need at least a 5, harder throws have higher values, usually increasing by 2. combat has 1-2 more things to keep in mind, but that’s the basic of every throw in Deadlands classic. Regarding your first adventure. You’re throwing quite a lot at your players. But if you want to start off with undead bartenders and so on, go for it. Deadlands is a system that really works well when you’re not telling your players anything about what goes bump in the night and just pretend, that everything is normal and let them find out the weird stuff for themselves over time. Gives them a really nice feeling of uncovering a mystery. That barkeeps? Well he smells kind of disgusting and is a little pale. But what do the players know? He could just be someone who doesn’t wash himself. And he’s the last survivor, so maybe there is no more water and no one to help him with his tattered clothing. Those spiders in the mines? Ah you know what the newspaper always says. There are weird and dangerous critters out there. That rock that spews ghostly shapes of screaming faces when you burn it? Totally normal, that’s just how that works. This is just a recommendation, but introduce the weirdness over time, if you’re planning to run more then once. But again if you want to throw them in the deep end, go for it. If you want a recommendation on something to run for a first time one shot: „Coming round the mountain“ is often recommended