We are glad you are here, too!
I am so sorry to hear that you have lost both of parents and a sister to Alzheimer's, and that your brother has been seriously impaired as well. It is understandable that you feel intimidated as you approach putting all the pieces together. Having read Dr. Bredesen's book is a great start. You will find many resources and a warm, supportive, and well-informed community here to support you on your journey.
A good place to begin is with the Primer. It is written by Stavia, who is a physician member, and it will give you ideas, prioritized in terms of their importance, of steps you can take now (in addition to giving up that beer!) That way you can be working towards reducing the risks that the ApoE4 allele carries even before you find a physician to oversee your progress. In my experience, the labs that are listed in the Primer as ones to start with have all been covered by Medicare.
Here is a link to the Primer: viewtopic.php?f=33&t=1418
Take your time reading through it. As questions come up, please post them. We are all here to help each other. And in terms of having to put the whole process in place by yourself, I hope that by participating in this community, you will realize that you are not alone.
Once you have gone through the primer you can find more information related to any particular topic using the Search function. You find that by clicking on the three stacked dots to the right of your name.
Wishing you well!
Functional Medicine Certified Health Coach
IFM/ Bredesen Training in Reversing Cognitive Decline (March 2017)
Qualified ReCODE Practitioner