1st Cubs Game for my 12-year old

We told my son in November 2020 that for his 10th birthday we would take him to Wrigley for the first time. Well, for COVID and other reasons, we are finally making the trip to Wrigley on Friday (he is only 12 1/2 right now!). Looking for any suggestions to make this a great experience for him...

We don't have tickets yet, where is the best place to buy tickets ($75-100 price range)? Buy on Stubhub?

Is it worth it to arrive 2 hrs early for batting practice? Where should we go if we do?

Is it possible to get autographs? If so, where is the best place to get autographs?

Anything else a 12-year old first time Wrigley visitor should do?

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