BREAD BAKING

I've recently started making breads & biscuits. I've done fairly well in the past making cakes, pies, & cookies. But I am having considerable problems wit my biscuits & breads. Let me start with bread..either the dough will not rise or it'll only rise one tim and that it. When I bake its coming out FLAT! Biscuits are another story. ome will come from the oven standing tall & inviting while part of the same batch comes out looking like flat tires...completely deflated. One overall theme is occurring with all...everything comes out "HEAVY"!
I don't understand what I am doing wrong with my breads.. Can I get some advise/help please?

Thank you