There is no rule at all. If you think that the drum bus needs an eq, then go for it. For instance, you might feel that the drums sound good, but the highs need to stand out a little more, in which case you could use an eq to accentuate the highs a little bit more. I usually use Splice samples (one shots, not loops), which are already processed, so I don’t always need to process them again. But, 99/100 times, I process them as a group/bus channel. This would usually be, eq - light compression - transient shaping - distortion/saturation - soft clipping. Again, there’s no rule, the goal is to make them sound the way you want them to sound. Now whether you achieve that by not using an eq or using an eq, is totally up to you :)
If you want to make just beats and want to use the piano roll while doing so, might I suggest you take a look at FL Studio? It’s one of the easiest DAW to use and a lot of EDM producers & beatmakers use it, to work in a style similar to yours (drawing notes in the piano roll). That’s how I started. I still use FL Studio to this day. Although, I’ve grown into using traditional DAWs like Cubase, I still sometimes enjoy using FL Studio. It’s very very quick and gets you to the point quickly, as compared to something like Cubase. Cubase is a beast and can be super powerful if you know how to use it. But the learning curve is quite steep as compared to FL Studio. As for the tutorials, both of them have good resources available online on YouTube etc. Try the demo and see what you like.