WHAT IS BEST WAY TO SELL MY HALF OF PROPERTY W/ MY NAME AND SISTER NAME ON 1 DEED??? CAN I SELL MY HALF W/O HER KNOWING??

If you and your sister own property together, the interest you own is "undivided"; in other words, you do not own any particular portion of it that you can sell, because you must sell a one-half interest in the entire property. No one will buy that from you except at a huge discount to its value. It is extremely unlikely that you could do so without your sister's knowledge, although her consent would not be required. Any buyer would want some kind of agreement with your sister. If you want to force a sale of the entire property, you can probably do that legally. Needless to say, that would come to your sister's attention.