Oh, no, it's totally fine for you to make a request! I just wanted to move the thread to the correct section and make sure you didn't get too down on yourself!
This game is certainly confusing when you get started with it - I started playing later than most(and I had never played Sims 2) in mid-2011. It took me a little while to wrap my head around CC and properly installing it, etc.
Did you mean you tried to download a sim from theexchange? Be careful with that. There are obviously some quality things available there (Custom Worlds, etc) but since there is almost no filter on who can upload what, there is a lot of broken and corrupted content available. If you're new to the game, and start downloading a lot of sims especially, there's a chance you could install some broken CC into your game. I would advise staying away from there, unless you know the creator you're downloading from. Even then, there are times when clean files become corrupt because of errors with The Exchange itself.
First things first, if you are going to download CC - whether it's for sims you make or others, you should have the following programs:
This will scan your package files and let you know if you have duplicates, conflicts, or corrupt items. There are some things that Dashboard does not catch, but for the most part it's a pretty solid tool.
This is a tool for checking and cleaning Sims3Packs. If you download sims in Sims3Pack form, you can check to see if they have any corrupt content included by opening the Sims3Pack in Custard.
If you run into any technical problems with your game, you can check here: http://sims3.crinrict.com/en/ , and of course, you're welcome to post any questions on this forum and we'll all try out best to help.
Now, back to your simmie, are you going for a realistic take on the character, or do you want to keep more exaggerated features?