If you don't have very much of a portfolio it is very difficult to get work. You need to start low-end and maybe even do some for free. Also if you can't show them weddings, you should be able to show them portraits, products, landscapes architecture etc. They will be much more inclined to trust you if you show them you are competent behind the camera. If you don't feel you are competent you shouldn't be shooting peoples weddings even for free imo.
PS
If you are using aperture priority and not full manual, then you may as well use auto ISO and set your minimum shutter speed with the auto ISO settings. This will help avoid blur if you forget to up ISO in low light, and it will stop you blowing out the images if you forget to lower ISO in bright light.