Making Music Made Easy As Soup

Drums

• In most basic drum beats, the high hat or the ride cymbal plays on every crotchet beat, or every quaver beat;
• the snare plays on the 2nd and/or 4th beat of the bar;
• The kick plays on the 1st and/or 3rd beat of the bar. You can loop (repeat) the drum beat.

NOTE: the drummer only has 2 hands and 2 feet; what this means is that they can only play 2 drums at a time plus the kick plus the high hat pedal.

Try to avoid writing parts where a real drummer would have to use more than two hands. You can then add in open high hat notes. These create diversity. Diversity is the key to an interesting drum beat.
When composing a drum loop, you should make at least 2, or preferably 4, bars of drum music. This will create the necessary diversity. If you're stuck with a boring 1 bar loop and don't know how to jazz it up, try adding percussion (tambourine, shaker, bongos, congos), claps, rim shots (snare), toms, cymbals, or any other percussive sounds that you can record (e.g. shoes brushing through a shoe buffer).
All these things will make the drum beat more interesting. If there is anything rhythmically significant happening in the other instruments, it is sometimes effective to also have the drums mimic that rhythm.

Next: Learn about Bass (bass guitar, bass synth).