When I transfer the to the computer they are small pictures y if I want to print a 8x11 picture it gets very blury As with all digital cameras you must shoot photos using the highest quality your camera affords.
In your case you did not tell us what model Sony you have, so we can't tell you exactly what you can expect.
Generally if the camera has a sensor larger than 3mp and you have used the highest resolution and file size, you can expect to get good 11x14 images from your files.
I have a nearly antique Nikon Coolpix 990, 3.31MP that will actually give me a slighly larger than 11x14 image (this means I have cropped the image a little before printing) | 