basic tricks- sliding on boxes/rail with simple, easy kinks;  180's and 3s;  start learning grabs w/o spins; maybe spins off of rails and boxes or switch ups if you are feeling adventurous
also just know simple courtesies, don't cut people off when they are dropping, don't hop off the side of kickers- park skiers just don't like that, but of course you probably don't need to be told this
overall, just get comfortable, start small and work your way up. you shouldn't feel awkward or nervous when you approach the same feature every time. develop your own style, find out what you like (rails, jumps, certain tricks, etc.) and have fun