Does anybody have any advice for orchestrating? Or any further reading on the subject?

I have taken over the last number of months to try and compose as much as I can. However, being predominantly a pianist, I know little to nothing about orchestration, despite the fact I listen to orchestras nearly all the time. The last week, I've been trying to write for an orchestra. I *guess* you could say the tone of which is similar to Two Steps from Hell or Ivan Torrent etc. but that would probably be an insult to them. I'm satisfied with the melody I've developed (as in, for violin 1's), however, I am not satisfied with the accompaniment (double bass, cello, violin 2's. I'll worry about the rest of the instruments later, strings is just the opening part). It sounds cheap, or unprofessional, but I'm not exactly sure where the problem lies (it could also be musescore's not so great midi effects, but usually it's a decent indicator). On a technical level, what's written is chords just being played. What I did was write and play the melody on piano and transfer it across to orchestra, just assigning the parts to different instruments. I know this is how numerous composers function, so I don't think there's anything wrong on that front. I also know you can sort of have additional melodies played by violin 2's, but for the moment, that's not fully what I want.

What I'd really like to know, is if there are any tips on how properly orchestrate? I know this is something people can spend years studying, but I am literally approaching this with no no knowledge of how this works and I'm desperate to try and figure out what the best methods are to try and go about this. Also, is there any further reading on the subject at all in any regard? I was reading a few of them and the large majority of the books are very old or outdated. If any advice from any capacity could be given, I would seriously appreciate it. Also, if you would like to hear what I have written, I am more than willing to send the score on to you (it's only about thirty seconds and of course is on musescore).

Thanks for your time