These are not live plants, so there is no risk of pests to start with. Once the tree starts growing, there might be a risk of pests. You can apply organic pesticides to prevent from pest attacks. Please consult with your local nursery on the best ...
You can keep the tree growing from the cup or pouch until it outgrows it. But if you'd like, you can repot it as well to a bigger container. You can get soil from a nursery nearby, you can also purchase organic potting mixes online.
It takes 2-6 weeks for the seeds to germinate, so it might be just a matter of time. But if that time has passed, please report the issue to info@forestnation.com with photos and also let us know what tree species you were growing. There might be ...