A good goal for you for the end of the year would be probably be to jump very small cross-rails or verticals at a trot. However, you may be farther along or not as far as that by the end of the year, and both are ok. Like others have said, remember to keep your mind open and if you feel like you are stuck on something don't get discouraged. It took me a few months to get my posting right!
Now, my instructor has a mental list she keeps of things you have to do before you move up to certain things. Here's the one she has for moving up to cantering:
*Be able to walk with and without stirrups
*Stand up in stirrups at the walk and trot'
*Two-point at the walk and trot
*Post on the correct diagonal
*Circle at the trot
*Change directions when trotting
*Be able to post with and without stirrups
*Be able to sit the trot with and without stirrups
*Be able to extend the trot
And there's the unsaid things: Can you do all this with a decent posture? Can you control more advanced horses while doing these things? Etc.
There's a LOT of stuff that goes into riding. I'd recommend reading a LOT of books. That way not only would you learn more about horses and riding, but you would also be able to set yourself realistic goals.
Before you do entry level showing, ask if your barn has any "Fun" shows. These shows are more for the spirit of it rather than to actually win anything, though they do usually have ribbons and maybe trophies. They don't usually require any special clothes (though you are supposed to dress nicely) or any very special grooming (but you are supposed to make sure your horse is groomed as best as you can). These make some good practice. But, if you have no choice but to do regular showing first:
*Make sure to bring a friend or two. They should preferably know something about horses or be able to learn in about two seconds. These people are your Grooms for the day. They will help you groom and tack up your horse, help keep track of which classes are happening and how many classes there are until your next class, give you a leg up if you need one, give you and your horse last-minute touch-ups while you're mounted and waiting for the other class to head out of the ring, and MORE! I would also make sure these people love you, because it's hard work
*Make sure you know any rules the show may have.
*Make sure you know which classes you are in and how many classes you have to get ready inbetween them. (It's a good idea to try to get the worse of the arena dirt and/or mud off of your horse before you go to your next class if you can).
*Make sure there is somebody listening to the loud speaker!
*Bring money. You will get hungry and thirsty. GROOMING:
*Show sheen is my preferred shining spray. Make sure NOT to spray on the saddle area as this makes it very slippery.
*If your horse has white markings, baby powder works nicely for them.
*Baby oil for the ears and around the eyes.
*A spray bottle full of water is handy. I usually use it to help braid manes, but there's probably all sorts of ways you can use this.
*Curry comb, dandy brush, and a finishing brush.
*Mane and tail comb/brush.
*Hoof paint. (If that's what it's called...my mind just went blank lol!)
*Rubber bands for braiding.
*And more. The internet has tons of good ideas for making your horse look perfect on show day, the ones above are just what I usually use. TACKING UP:
*Any other things you may need ETC:
*Bobby and safety pins
And HAVE FUN! Remember, it's for fun, not so you can win! (Even though winning is a lot of fun, too