In End a letter^x, Articles^x

Can you please tell me if a to-do list can be in point form? Things to Do: Send a letter to a friend I met yesterday. Pick up from Family Store gift for a friend I met two days ago . Put some gas in my car on the way home. Can I omit all articles and make like this? Things to Do: Send...

It's a very difficult subject - to use 'to'or 'for' My family is very important to me. That is the right sentence. a) I sent a letter to Mary. In that sentence I wrote a letter to Mary and sent it to her in another city, country... b) I sent a letter for Mary. In that one Mary wrote a...