When I google I generally use the word 'model' somewhere in my search. Or you can look for a model site. There are plenty of tumbler pages dedicated to beautiful men and women.
Not to mention that you can look through the Finders and Seeker's forum.
We are constantly posting pictures there that you can use for character images if you so desire.
As for getting a picture to show up in a thread there are buttons that wrap around your code either before or after you type it in.
Take for instance my avatar. With out the IMG code it looks like thishttp://i623.photobucket.com/albums/tt317/in_the_dark_photos/Male/ava/ava_dissi8.jpg
So if i highlight the entire string and press the Insert Image button
It displays as a picture
Many people resize their pictures using code. Someone else will have to help you with that. I prefer to use thumbnails and have the image link to a larger version of that image. To do that you highlight the image code and the link contained with in it and press the Insert Hyperlink button
Then insert the link to the new image preceded by an =
sign after the 'L' in the first url.
Click the the following image and a new picture will open up in a new tab. It's a different image because apparently I don't have a larger version of it... I'll have to go hunting later...
Since my character pictures are generally not showing naughty parts I host them at photobucket and that site will generate your codes and links for you.