NO, NO, NO ... wrong on all counts. Lots of unscrupulous dealers out there.
Your bonsai is a juniper tree.
1) It is an outdoor tree. It will DIE indoors. It needs to be outdoors summer and winter.
2) It needs full sun, although if it has been inside, it will have to be gradually adapted to being outdoors and in the sun.
3) Never water bonsai on a schedule. Water when it needs it, which will be different time periods depending on temperature, humidity, soil, plant size, etc. Check the bonsai learning articles here: https://www.helpfulgardener.com/bonsai/
for instructions on how and when to water.
4) It looks like it is potted in dirt or at least potting soil. That is very bad for it. This is likely the wrong time, but in spring you will need to repot it in to real bonsai soil, which is very loose, gritty and free draining. In the meantime, you will need to be very careful not to water too often, since your dirt will be very moisture holding.
Never go back to this dealer! If you paid very much for your little juniper cutting, complete with instructions which were guaranteed to kill it, I would report them to the BBB.