Hi,
I just started about a month ago, so I'm in the same boat as you are. I do have some advice if you have the time and a good printer.
All you have to do is take a look at your starter deck(by the way, which one do you have?) and look at what combo is good for you. Then get a good idea of what other trainers, supporters, and pokemon you wish to use. Next, just type in the card's name on google, yahoo, etc.. Copy and paste the image on some type of word document, excel, etc.. and then make as many copies as you want.
I've found some pretty cool ideas just using copies. I started out just buying packs though, and only ended up with like 3 of the cards I really wanted.
After all this(if you want to do it), and you have an idea of where you deck will be headed, then you can start working on obtaining those cards.
Hope this helped you some.