Sign powers of attorney for health care and finance. As assets accumulate, consider a trust. But you'll need to see an estate planning attorney to do the work. You can be your own trustee and you can get the income from the trust. But if you become unable to manage your assets, someone else of your choosing steps in to do the job.
Taxes Keep records.
Single people need to have many of the same good tax habits as married folks, but since they don't have anyone to help them, they need to be especially diligent. That means keeping meticulous records, canceled checks, bank statements and copies of your tax returns. Delay the sale of your house. If you're single but soon won't be and plan to sell your house, it may pay to live there a while after you get hitched, then sell. Max out your retirement plan.