You can apply for the $10,000.00 Service Disabled Veterans Life Insurance within TWO years of any rating decision, even a 0% rating.
You can either fill out VA FORM 29-4364 or fill out the online form.
Here is a link to the SDVI page:
VA Service Disabled VEterans Life Insurance
Once you get approved for the Life Insurance, if they do not already see an infered claim for a Waiver of Premiums, then you just request that they give you a Waiver of Premiums. If that is approved, then the $10,000.00 in life insurance is premium free for you.
If you do get approved for the "Waiver of Premiums", then you automatically become available to purchase an additional $20,000.00 of Life Insurance, but you must pay for the additional insurance, you can not get a waiver on the additional $20,000.00 of insurance.
So you end up with a total of $30,000.00 in insurance but you only pay for $20,000.00.
Hope this helps!