Any tip to compose music with more than 2 instruments?
 

I have some ideas in mind and some friends from orchestras, so you know, i might try something but need some help :)

I'd use a pencil instead of a pen.

This is great advice 10/10 would read again.

I don't know if you guys are being sarcastic or not, but when I started to learn to read and write music this was one of the first tips given to me. Use a pencil. Lol.

Something that works for me is to start really simple. It can be a simple melody, rythm or chord progression. Then i just start filling up the gaps. If you wanna do many voices doing different things at all time, like in a JS Bach way or an orchestra, i would just recomend to follow the main voice wherever it takes place, for example if in some part of the song the bass is the main one don't try to make the high voice too complex in a way that dosen't mix well with the main voice. It would definately help to know a lot of harmony and rtyhm.

Use a DAW :D

Decide first what you want to compose- whether using an existing type or genre of piece or creating your own. In other words, have a concept first- and then actually composing will be easier.

For example, you might want to create a symphony- in which case you'd probably want to use symphonic form and assign roles to different groupings of instruments for different sections, or tweak and change this concept/form a little.

Or you might decide you want to create a piece where every instrument is playing different rhythms at the same time; then you just have to decide for how long and what those rhythms are.

Having a clear concept will tell you how to place instruments and compose material to fulfill it. It's much easier than just sitting down and writing without any prior plan, although you can also try to do that- you can improvise a piano piece and then arrange it or orchestrate it for your ensemble. But then even that is a concept.