Not enough info, if you have shelves with brackets using wood screws into wall studs generally gives the best performance with heavy shelves. If you're looking to make brackets for glass, you need a lot of support, more for thinner glass, and most off the shelf solutions are made for wood. You'll notice most glass shelves or tables have glass insets supported all the way around, or thick tempered glass with fairly wide and thick support from the bottom. Glass is hard because it is brittle and difficult to attach cleanly. Good luck.
Try YouTube or Google dear, this really isn't the place to get "those" kind of answers, unless someone else wants to chime in. Besides, we will probably need more information than that to get you a good answer.
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