pruning of saplings

Hi everyone! I'm new to the forum and bonsai as a whole. I just bought a creeping juniper (juniperus horizontalis) from my local nursery with some help from the nursery's bonsai enthusiast. I already pinched off all of the dead and brittle leaves/branches, as well as snipped a few tiny branches...

Dear Friends, I have recently received two Saplings that I intend to turn into bonsai trees in due course. One is a Japanese Maple and the other is a Baobab. I will attach their pictures along with this. My query is, how do I start my bonsai journey with these plants. Do I begin to immediately...