Ok, go to the search function and type in the word "freebie". Go to one of the gazillion places it recommends. This will get you something that looks pretty much human unless it specifically says otherwise. You do not need any $L to look halfway decent in SL: but others are right, the really good stuff does cost some money. It may take a long time to find something you really like: but there are thousands of options for free looks. Also you can browse the marketplace for freebies (things that cost 0$L). Make sure you're using a classic avatar: the free mesh avatars that come with your account can't wear any clothes besides the ones they came in. You can change the shape of your classic avatar right in your appearance menu. Also, if it's the lack of movement that's bothering you, you can add physics to your avatar in the appearance menu as well. Experiment a bit and find something that works for you, or change your shape and look every day: whatever you want.