How can I best get back to where I was ?

I really am not sure - you're much faster than me - but i wanted to chime in and tell you the little nugget is adorable! 

Consistently getting back to running is probably the best first step! And tackling some shorter race distances which you are doing - 

I know how you think (i am in that boat too) but it's still super important not to jump into too much too soon. It seems like you are taking a long view so why not create a bit of a road map with intermediate steps - PR's or paces to achieve or plans to try over training cycles that should help you get there?

Plus, don't forget  to race for fun too ... :D 

One of the pieces of advice I frequently give personal training clients and workplace wellness class participants is to train based on where they're at, not based on where they used to be or where they want to go.  I frequently see middle aged men who wrestled or ran cross country in high school who tried to jump back into training the way they did 20-30 years ago.  Guess what?  They usually hurt themselves.

The same applies to you, but the adjustments to your program aren't as drastic.  Just be honest with yourself regarding what your body can currently handle, and overreach that slightly.  You can get back to where you were, but it won't happen in a week.

Definitely. Your training is always based on where you're currently at. What you could (and should) do now is look more at running in general. Keep getting the miles back in. Also work in some faster running as you are able. Don't have to kill yourself with it, but some is good (and again, based on where you're currently at). Since you're at 25 mpw, I would actually back down on that long run for now and redistribute the miles elsewhere if you can. That one alone is 40-45% of your weekly total. If your other runs are building up then it might be ok as it'd be temporary, but that size long run is more suited for a total that's at least in the mid-30's.

And while you're building up your running again, you can keep track of progress with some shorter races. Use something like Daniels or McMillan charts to see when the shorter races are getting near an equivalent marathon time and then start making your push out for the longer one when you feel up for it.

Just to echo what's been said, you do the same thing you did before.  Build gradually and use volume, frequency and intensity in varying combinations to elicit adaptations from your body.  Getting back to where you were will likely come quicker than it did to get there the first time (but may still frustrate you initially because it may still take some time).  As others noted, train based on where you are now and not where you were or where you think you should be.

And congrats on the little nugget! She is a cutie!

Thank you all for the good advice!

Two more questions:

1. I'm following Hal Higdon's Advanced HM plan. I'm not sure what to use for my paces for the workouts like 4 x 800 at 10K pace/ 8 x 400 at 5K pace. Suggestions?

2. The 12 week plan starts the end of the June for me. Good idea to just repeat, with some variation, the first couple weeks of the plan until it "officially" starts? The first week of the plan looks like this:

Have you been doing any running that's faster than easy?