Making a beef roast in a crock pot.. what do i need?

So ive never never been a good cook & my fiancee comes home tomorrow & i wanna surprise him with an amazing Beef Roast... Its frozen at the time, & i plan on let it slow cooking in our crock pot for 8 - 10 hours. I have the roast, potato's & carrots. What spices and/or other things can i add to make it rele good?? PLEASEEEEE HELP ME!!!!