When you have no experience in anything is clear that there is always the worry of making a mistake when you are engaged in sensitive operations such as watering plants.
Usually you never know what the correct dose to be given to plants and especially that now they must receive their amount of water. Regarding the first concern, this can be solved quickly trying to learn more about the nature of the plant that must be treated, sources there and I think that the Internet can be helpful in this regard. Otherwise, you might ask your neighbor if you experienced, or who has had experience in the management of plants.
It all depends on the type of plant and on the basis of its features you choose the amount of water to give, if it grows best the sun or shade, and if regular needs some work, like that of the more pruning to ensure its preservation as long as possible.