There are two ways in which to see the purpose of affirmations. Both are right. The first is that these short statements redirect the part of our mind that programs our life experiences, responses and reactions. In time these sink into our life's program.
The other is that these short statements actually reflect the true nature of who we really are. So the repetition slowly peels away the layers of conditioning that have dampened our creative loving self. Regardless of how we see them they are tools to our awakening. There are some very basic affirmations that can be repeated.
"I am healthy, I am wealthy, I am happy and I am wise." A very basic whole of life affirmation. It may not reflect your present situation but it begins to put ideas in place for the future path.
" I am confident, I am capable, I am successful" likewise begins the process of self establishment.
These two examples should be said quite lightly and frequently. We do not try too hard. We have to let it work quietly in the background until we find we have shifted. We have changed the way we perceive our existence. We also need to add these into our mindfulness and our meditation for they will not work in an isolated situation, they are part of our self discovery.
"I am healthy, I am wealthy, I am happy and I am wise."
" I am confident, I am capable,
I am successful"