You've gotten a lot of good advice. In addition here are a few approaches that might help.
You can always use a mantra or short prayer. This gives the mind something to concentrate on and enables you to experience the benefits of meditation. Eventually you seek the silent communion within.
You can try using an image as well. Whatever you choose will be fine. Something that represents your spiritual aspirations and ideals.
Guided meditations work as well.
Focusing on your heartbeat and breathing is another method.
Count to 4 using your heartbeat, you might practice this a few moments and when you are ready breath in 1-2-3-4, hold 1-2, exhale 1-2-3-4, hold 1-2 and start again. Other variations are 6-3-6-3 or 8-4-8-4, you just build up to them.
These calm the mind, Find the one or ones that work, we all find a different way to begin.