Hello... Glad to answer ur query. As per the history given by u, I'm still unclear about the scars u have got over ur stomach and back. Anyway, having a tattoo is definitely a good camouflage for the scars. U can get it done by a professional tattoo maker. But it'll be limited to few area of scars only. There might be few scars which can be treated by other ways.
Next Steps
The best thing what u can do is to consult a plastic surgeon, or online consult with me to know which are the scars u can go for tattooing and which are the ones u can getaway with few scar revision or laser procedures.