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Hello!
So I'm fairly new at the world of bonsai (got into and addicted for about 8 months now and have 9 different tree projects) and one of my ''projects'' is a maple forest; picked up a variety of maple seeds back in November-ish and the image below is the current status of it (6 seedlings, which i plan to expand with a few more later this year (bit of age difference i think it may look nice, idk)
Anyway, I'm just wanting a bit of advice on how to continue with it without killing them. I would like to mention that they've been grown completely indoors since germination a few months ago, I am planning on moving them outside within the week (We've had a lot of rain and if i had put them outside they're not going to be covered and i pretty much just put it off for too long thinking they'll rot)
So - yeah! Any advice would be much appreciated.

Thank you!

To continue without killing them, outside now. Water when they need it, and start fertilising. Are the Acer palmatum? The leaves look big for the size of the plant, let them grow this year, I would do very little to them, Later in the year possibly some pruning to remove branches from the inside of the trees but you will have to decide then. Rain is normal and will not cause rot.

For faster development I would consider potting them in individual pots for a few years.

Nice project, I am doing something similar, growing out a maple forest in a pot.

What I do, I prune the ones on the outside more frequently than the inner trees, pushing for bigger trunks on the inside, which is where naturally older trees would occur. In the first year I did let all of them shoot, and in mid-summer I GENTLY wired them to shape the trunks and have a little more interest than just straight arrows. Keep in mind trees need light and the outside tree will quickly shade out the inner trees so removing a leaf here or there can help.

My project for reflection:

Okay, thank you! that does help a lot, i'll get them outside and prune them later in the year - plus it's good to know i can start to fertilize them now too, i'll start with a low dose and see how they get on.
As for the identification i'm not sure tbh, they could be a couple different variants of maple; red and field maple would be my guess atm, but that doesn't account for much

Thank you for the advice Leatherback and that's such a lovely project you have there, so much colour! plus i really like how you've shaped them - So i think i'll prune later in the year or in summer and take a bit of inspiration from that with the wiring and give them a bit of shape!