Whenever I want to export an image it ends up being way too large. Is there any way to resize it to say 10mb or by pixels?
There isn't a way within Adobe Illustrator Draw to create an image that conforms to a specific file size (10MB).
File (space) size is a result of the canvas size, resolution ("ppi"), and the color compression on the exported project.
Canvas (shape) size is something that you CAN change in Adobe Draw.
If you need a raster file, a .png file is fairly light (small file size).
If you want to send it out as a PDF to your CreativeCloud account, you can keep the vector layers, but including raster (photos) as Image Layers in Draw will increase the file size of your resulting document.