I'll give you a little breakdown here just in case anyone else interested in the industry stumbles across this, and I'll leave my email at the end for you.
So, strategies for moving gas are going to be dependent on what your company primarily does. Gas is traded typically between producers, middlers (marketers/speculators) and end users/utilities/power generators. Each of the the 3 are going to have varying strategies to fulfill their gas needs. When a company says they 'market' gas, it generally means that they try to lock in either a producer with cheap gas or a utility willing to pay a premium on delivered gas. They can then fill in the supply or demand side with gas thats pricing them into a profit. Most shops that specialize in this have low risk profiles and focus on arbitrage opportunities. Most major producers have their own trading operations where their abundant supply is 'marketed' and often times leveraged as a way to conduct speculative positions in attempts to add further value.
As a scheduler, I'm essentially a volumetric accountant that ensures buys and sells made by my traders balance out, and that these trades flow from point A to point B on a pipe line. There's tons of nuiance to moving gas, as each pipeline has a specific system to "nominate", or line item transact, gas along their pipe. Each company moving gas on the pipeline has to buy capacity on the pipe, and capacity generally has various degrees of flow-ability. So schedulers are often times working their knowledge of their company's capacity strength and pipeline nuiance to help their traders find ways to generate profit. Generally, marketing and scheduling aren't entry-level positions. I started straight out of school as a scheduler, but I was a unique case in that my good friend had a lot of pull with the company that hired me and I was fresh off a 2nd bachelors in engineering. The learning curve was super rough for me. If I ever have pull on the hiring side, I won't hire someone without any experience. I cost my company tens (possibly hundreds) of thousands of dollars learning the basics. Typically, people start off in the back office confirming and settling invoices with counterparties.
When it comes to career path, generally the next step is to become a physical trader. But depending on shop, one can also step up to become a quantitative/pricing analyst, optimizer, marketer/originator, financial trader, etc.
That's all my late-to-bed self can think of off the top of my head. Hit me up at c gidd8@gmail if you want more specifics.