The past drink driving that went nowhere 13 years ago is irrelevant to your case today. With a reading of 68 you can expect a ban of 17-23 months. Because you had no licence or insurance you can expect to be sentenced at the top end of that. You may also be given a community penalty as the rules were revised downwards a little while ago, formerly you only got a community penalty when your reading was above 89. You will receive an endorsement for the drink driving no licence and the no insurance which will be discloseable for 5 years, but you will not get points for the no insurance / licence as the ban for drink driving means that other matters from the same circumstances that normally carrying points do not. If you do not get a community penalty then you will get a fine of about 1.5 times your weekly disposable income, costs of £85 and a ‘victim surcharge’ of £20, maybe more.
you can reduce the length of the ban if you are offered, and accept, to do a Drink Drive Rehabilitation Course. This will reduce the ban by up to 25%. Remember, It has to be offered, and accepted, on the day. If the magistrates do not mention it, some do forget, then make sure you ask if you would be allowed to do one. It cannot be offered once your case has finished in court. Having said that.... you don’t have a licence! Is this because you have never had one? If so, why on earth were you driving at all, let alone drink driving.......?