First, id... it's a variegated Schefflera arboricola.
Second, there are a bunch of problems. First, remove the sheet moss. It looks like florist's decoration and not living moss at all, so it's no place in a bonsai pot. It will just get in the way of your being able to water properly. And, if it's not chock full of antimicrobials (IMO in itself a bad thing if it is) it will degrade horribly over time. Second, check the soil. This looks like one of those plantings that have used traditional potting soil, not a good thing for bonsai. If it is potting soil, you'll need to replace it. Third, whether or not you replace the soil and repot is up to you, but I would definitely strongly suggest, at the very least, unpotting and checking the root system. The reason for this is that these are not trees you are looking at, they are cuttings. There has been a proliferation, this year, of Schefflera cuttings, unrooted, or incompletely rooted, being shoved into pots and sold as bonsai. This may not be the case with yours, but it certainly looks like one of the aforementioned types of mass-produced "bonsai". If it doesn't have a good, healthy root system, you will be better off rooting it in a glass of water than in the bonsai pot, for sure. HTH.