You don't seem to have much of idea on what are your chances for find the seed, right?
If only a small number of words are missing, OK, you can do it. But without no other info you will most probably not find anything useful during your lifetime (and I'm being overly generous on this).

So I recommend you read much-much more before offering this kind of services, which, at this stage, are dangerously close to what we call... scam.