ok i want to learn how to dm/gm but not sure where to begin? I just picked up deadlands and I really want to play it. @Sleeth
First and foremost, really familiarize yourself with the rules, then decide which ones are and aren't for you. Example; I only make my party in D&D use components on certain spells like Revivify. Not everything must be followed exactly, so find a comfort level in your game.
After that, you'll need to build your world. You can never anticipate everything your players will do, so you'll often just be winging it, but have a rough outline with a few set outcomes.
Ex: My party was hunting a band of Hobgoblins and found a lone goblin wandering the woods. They could've asked said goblin how to find the band and had a short cut. They could have offered the goblin food and gotten a gift, or they could ignore the one lowly goblin. Set event, a few set outcomes.
HOWEVER, the monk decided to just punch it.
Never bank everything on one interaction, find a balance of player freedom and control. 'Railroading' as its referred to, is forcefully keeping your players on a set track and never giving freedom. Some groups like this, others don't, be open to adapting to your group, talk it over with them.
That's it for my basic advice! If you have any more specific questions, ask away. Sorry I took so long to answer, I got busy this week.