Those are very reasonable goals. I would definitely find side hits to practice 180's and 360's, so if you fall it won't hurt. 3's take practice and a bunch of falls but you'll get em. As for jibs, boxes are your best bet to start. Boardsliding is a sweet fun trick and fairly easy to learn, fronside or backside.
The best way to progress in park (in my opinion) is to find a friend around your skill level and play them in a game of SNOW or "Game in your face". Everytime I play I always learn something new and it's a blast.