You need to meet with a shine voluteer.
There are many factors and plans, in chosing the right plan for you. There is only two basic options.
1. Medicare with a supplement.
2. Medical Advantage Programs witha prescription plan included.
The MA palns are for those who are basically healthy and don't require frequent visits to the family doctor, and or specialists.
Staright medicare with a supplement, is good for people who want to go to any doctor that accepts medicare, and don't want any out of pocket costs.
I have Florida Blue HMO Lifetime HMO that requires referrals from your family doctor, PCP.
Only you can decide what plan, best fits your needs.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).