Hi there! Thanks for the question. When You begin drawing at a young age, I think that you're still developing your skills and honing in your coordination, so even if you're not happy with what you're doing now, you will get better later on. As with any drawing, the paper should be smooth, with out wrinkles or scratches and your drawing tools (pencils and stuff) should be longer then your fingers, the position of how you hold it should be comfortable and you should have ample light so you can see what you're doing, and not ending up drawing some funky looking thing that might look like a pop-tart (like how my first drawing of architecture looked). Another thing to remember is to start your drawing as lightly as possible! If you bare down to hard the sketch would be very hard to erase later on, if there are any goof-ups. For architecture specifically, you should find something with a straight edge (ruler, cardboard, another pencil, exc.) and use that to help you sketch the straight, sharp lines of walls and to keep a lot of windows aligned correctly, and other neat stuff like that.
Another good thing to do is to pay good attention to the real world around you, or look at pictures of architecture examples on the internet. How tall the building is, how it sits in front of other buildings, how the sidewalks look around it and how the windows are aligned on the walls. Another good idea is to set aside 15 to 20 minutes away from phones, laptops and other distractions when you do your drawing exercises, so that you can focus better on your project. If you're smudging the drawing by accident, you can place a piece of clean scrap paper under your hand, on the drawing to keep the drawing safe.
My best advice though, would be to just use a straight edged object and just practice for a couple days on practice drawings. Draw squares, rectangles and other straight shapes, all together and mess around and experiment with different lengths, widths and other things like that. Try to keep your first practice sketches light and loose, so if you're not happy with your first attempts, you can banish them off the page with an eraser before you have time to get annoyed with it. Start drawings without pressing too hard, gradually add tiny details like eves, windowsills and bricks and other stuff like that slowly, and while you progress on the project, erase baselines as you go on. Take the drawing one step at a time, try not to rush and if you're really unhappy with any particular project, put it on hold and start something else or go back to a different project. Taking a break on something and going back on it later might help with not getting frustrated with it.
I think that's all I can think of for now, so good luck with your drawing.