Relax

You're at the right place for help!
First, do you have a program yet? If so which one?
I highly reccomend reading lots of tutorials to learn how to use your program. SBB has a lot, and there are tons around on the web.
There are plenty of freebies to download here. And even more if you want to pay $15 for an annual membership (it's a steal!).
Honestly, the best thing you can do is just dive in and try making a digital layout. You may get stuck, and then just ask about what you're stuck on
good luck!!