hello again. please somebody help me im really desperate and disappointed with my website which i bought from someone but cant help me.

my problems are:

1. shipping will not appear after customer orders
2. im planning to have combine shipping discount or free shipping over certain amount? what is easy?
3. how can i edit the general text displayed on my website?

where and how to edit all of these. please explain to me step by step bec. i have no idea. but i can understand html but don't where to go to edit it.