Washington State ID/DL# are the easiest to figure out, and be able to verify their accuracy as well. Their numbering algorithm is not random like many states. All you need is Fname, middle initial, Lname and DOB. This simple tool will calculate it for you
http://www.highprogrammer.com/cgi-bin/uniqueid/dl_wa
Once you have the number, you can head over to the official licensing webpage of WA state
https://www.dol.wa.gov/driverslicense/checkstatus.html and click "Check the status of a driver license". There, just enter the number calculated and you'll see if the information is valid, and the expiration date of the ID/DL as well. To calculate the issue date, subtract 6 years from the exp date and choose any random non-weekend date/month combo.
Now, when it comes to applying for credit, every single application will imprint a "hard inquiry" on your credit report that will become visible to every entity that subsequently pulls/refreshes your credit report. Therefore you have to be very careful here. I think a single hard inquiry a day with a pause of at least a month in between inquiries is a relatively safe route. Anything in-between and, in my experience at least, your chances of instant approval are greatly diminished. And also make sure that the entity you're applying for credit from isn't already on the person' credit report as an active/inactive account. And a last caution, there is always a chance that your victim has an active credit monitoring in place that will notify the them via text/email as soon as a soft or a hard inquiry is placed on their report, so consider that as well.
You can obtain a sim card, sure, but remember that they will cross-reference your number with their commercial/proprietary DBs and figure out that it is a new number. It doesn't mean they will deny you credit since the mail-to address is already long established, but it may affect their fraud scoring of your application. It may be safer to just use the victim's phone number initially and once you're in possession of the card to spoof your number and call the institution to activate, and then you replace that number to one of your unused disposable number for future alerts.
Good luck.