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Once a week is good... But sometimes I do it twice a week. But if I do, the second time around I will only use conditioner... That's also known as co-washing.

Now, if you're going to wash your hair every week... You should deep condition after every wash. And use a hot oil treatment at least once a month.

Now, as far as products go... I stay away from anything that has petroleum and/or mineral oil in it. It clogs the pores in the scalp and doesn't help at all. Try to use natural products if you can. They're a bit more pricey, but they're better for your hair.