Welcome to Tropical Fish Keeping forum.
At the head of the Aquarium Plants section, there is a series of 4 articles entitled "A Basic Approach to the Natural Planted Aquarium" that will provide lots of background information on simple planted tanks.
The Fish Profiles section (second tab from the left in the blue bar across the top) has a lot of fish species, and information for each on preferred water parameters, compatibility, numbers (many have to be in groups), etc. Knowing your tap water parameters (hardness and pH) is essential before you decide on fish since not all fish will last in any water.
As you browse these, questions may arise; don't hesitate to ask, there are lots of members with experience here.