I'm never quite sure whom to ask specifically for what specifically. The exceptions are asking Lord Ganesha for a safe trip, even running errands. When I get in the truck I say the śuklāmbara dharam vishṇum sloka. I thank Maa Lakshmi for the material things I have, even when times are tough; I rarely if ever ask for something new. I ask Lord Hanuman for strength and courage. But that's about it. I guess I'm one of those people who is not a pray-er.
I find prayer more about communion than asking for stuff.
Stickin' to yo ishta can get everything done that needs to be.