LB- in terms of intentions, the main thing is to think in general about how much you love Hashem and how you want to serve Him and how your purpose in life is to serve Him.
If you are generally conscious of the fact that your entire purpose in life is to get close to Hashem, then on some level everything you are doing becomes part of that. Even when you are eating or sleeping it is all for the general purpose of being a healthy, happy person and the reason for being a happy, healthy, person is to serve Hashem.
The point is that you don’t have to worry about what you are thinking about each second. There may be such a level but it’s not one you need to think about right now. As long as you know in general that your purpose in life is to serve Hashem, that is enough to give meaning to everything you do.