Great advice from both Brett and Shirley below. I think most of us who have been here for a while will discourage you from uploading a GEDCOM. It kind of creates a big hole for you to fall into that has steep sides and is hard to climb out of. ;-)
Like Brett says, if you want to see what the process is like, upload a very small file.
Mainly, spend some time looking around and reading help pages and G2G posts. There is a lot of information here and a learning curve. Things are quite different from other genealogy sites because of the "one big tree" structure. When you import a GEDCOM, family connections are not made automatically because you have to sometimes skip an ancestor who already has a profile. It's usually easier to build your branch manually and copy & paste from wherever you keep your information.
By the way, asking here in G2G is the best way to get help and feedback. So, kudos to you!! :-)
p.s. I added a few tags to your post so that others will find it more easily.