How to reconnect?

Okay I have a few questions since I am dating again, I have two guys in mind that I would like to reconnect with. One I've known since middle school but he became homeschooled at the beginning of 8th grade and I haven't talked to since, also he's the twin brother of my ex boyfriend from middle school 😅, how would I go about that?
The Next guy is someone I met about almost 2 years ago but haven't talked to in about a year and he's always liked me and shown interest in me, but I've never noticed until someone told me later on after we didn't see eacother anymore, cause apparently I'm oblivious to guys flirting. So how would I go about that?
How to reconnect?
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