It's true, the easiest to start off with is two tracks with similar drum beats - if the drums are all over the place, it is more difficult to match them for newbies as a general rule.
You should know the basic of music - roughly, DnB is in 4/4 time, meaning you can count 4 beats to a measure.
Every 64 beats, you usually get a 'small drop', but not always; and then there are big drops, clearly audible as they come after a 'build-up' period.
If you look at your DnB vinyl, you should see a dark part and a slightly clearer part. The point where the two meet usually indicate a drop; this is to make it easier to find this drop.
When mixing two tunes as a newbie DJ, your first task is to be able to beatmatch. Learning to do this takes a different amount of time for everyone - some get it immediately, others never. However, it doesn't come in stages - it's just like rolling a cigarrette, one day you can just do it.
Once you've done that, then you can build on it. Learn about drops, understand them, know your tunes, your ear needs to learn what sounds good.