A: For your two daughters, specifying how much you would like to give each of them (90% to one, and 10% to the other in this case) is almost as simple as saying just that in a properly executed will. Wills can leave what are called "bequests" to different individuals, and you can specify however much you would like to give to any individual with your will.
If you are concerned about one of your daughters squandering the money or are otherwise concerned with the government taking the property you give, the will can create what is called a "spendthrift trust." This trust can manage that 10% of the property you decide to give to her for that disabled daughter's well-being, but she technically does not own that property; it is merely being dispensed in intervals per your instructions that you put in the trust for her health, well-being, bills, or whatever you deem appropriate. The spendthrift trust is then run by a trustee, which is someone that you think is responsible to manage this trust on the disabled daughters behalf (it could even be the other daughter if you think she is a good fit for the job).
For both of these matters, however, I strongly suggest seeking a Colorado attorney to advise you with drafting a will containing these provisions. Even though the first matter of giving 90% to one daughter and 10% to the other is simple to draft, failing to create the will properly may subject your estate to "intestate succession," which based on the information provided would mean each daughter would end up with 50% of the entire estate.
A: Generally speaking, you are not responsible for the debts of another person, even if its your husband's medical bills as in this case. Since they are in his name only and you did not sign anything personally guaranteeing payment, you are not responsible for that debt.
However, your husband's estate is still responsible for paying that debt. As his estate goes through probate, the hospital can make a claim against the estate in order to satisfy the debt. If you are a beneficiary of his estate, this may affect how much you receive from his estate, and thus can affect you indirectly.