With regards to a will, is it wajib that a wasiya must be written in a certain format? Or does it suffice to simply write a few things you'd like executed etc and appoint that?

If it is wajib to use a certain template, where do we attain such template?

It has to include all the right shares and you can consult Sayyed Mohammad Rizvi of Toronto Canda as he has written a template for a will