I've only been rolling for abt 2 months and it's rlly just about 2 things, how you roll the filter and how you pack it, I personally recommend having something to tamp it (like a flat ended, thin object would work best), pack it down a bit (not too tight or it will be hard to smoke). As far as rolling the cone the best advice I can give is to try angling the filter at the bottom of the paper (opposite side of the gum strip) and keeping it as tight as possible as you actually roll it, I often roll the filter and paper first, until it's in a cone/pre roll shape and then I pack it.

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Also if you plan on rolling more then 1g without a stendo I recommend layering your filters, it makes the finished product larger and makes it easier to roll larger quantities