That's not really an unusual request (most people seem to have enough patience to learn to model, but not enough to even try
weighting). I've seen a dozen people ask for someone to weight their model and I think of those people none have been successful.
You will be more likely to get what you want by doing it yourself (unfortunately) since model weighting is arguably the boring and least entertaining part of modeling, and most modelers are hardly willing to weight their own models, much less someone else's.
There are some great tutorials out there if you need somewhere to start. I recommend this tutorial
or this tutorial
to start with.