These people who answered your questions are really smart and offer good advice. I would also add that you should start fixing your inventory up now so you can find things later.
I have a section for body parts: In it is Avatars - Complete, Heads, Feet, Hands, Eyes, Skins Only, Skins and Shapes, Shapes only.
Clothes are broken down by fitmesh, tonic, omega, maitreya, bellezza and with those categories by bottoms only, tops only, dresses, outfits etc. Shoes of course have a category all their own with the clothing folder.
I also make a folder in each item that I buy where I put the original - It is called Boxed Original. I can always find my original this way if something happens to the one I rezzed.
Good luck in your Second Life and remember to take time off from here because it can become very addicting.