Hi! Nice listing (i have this one!) ;) tho you might want to check out Listia Rules' page: Listia now has imposed a maximum shipping charge of $4 for books (most manga cost around $3 max to ship with delivery confirmation anyway, so you should be good), so you might want to adjust that before your auction is removed here's the link:
http://www.listia.com/rules#sh
Also, you don't mention what forms of payment you accept? (it helps so you won't get bombarded with questions about it)
(This Will Sound Wierd) But, I Havn't Had Experience W/ Paying For Shipping. So Do You Mind If I Ask You A Couple Questions? 1. Who Do I Pay? The Delivery Guy? 2. Do You Pay Part Of The Shipping And I Pay The Rest When I Get It? 3. Do I Have To Have A Credit Card To Pay?
it's ok, you're new so not likely to know the rules yet ;P
and actually i've found that shipping just one manga can usually ship via First Class for the same cost as Media Mail (for one book), so you might want to ship 1st class when you can (gets there sooner and not subject to inspection like MM is) (^_^)v... oh! and you can hit the "reply" button to answer ppl's questions too.. that way they see your response in an email (instead of having to check back on the auction page to see if you've responded).. like Ishida here, hasn't checked back here to see you've answered his questions ;)