That is a huge step, just setting a time and a date, prepping a little, then just diving in! Stoked for you, this is where it all begins 
Here is my Craigslist ad, btw, just took out personal info, feel free to use as a template, and modify! :
Newer Bass Player Looking for Drummer/Guitarist/Vocals for Jams, Band (My area, My City)
Hi All!,
I’ve been into music my whole life, but took up playing bass about 6 months ago. I’m pretty dedicated, and have the time, so been taking lots of lessons, and practice, practice!
Looking for drummers, guitarists, and/or vocalists at ANY level to hang with. Let’s get better together! I am fine with jam sessions, collaborating, learning songs, playing covers, creating music, whatever the vibe.
I’m 42, but tend to get along well with anyone from their 20s to their 60s. I’m into music of many different genres, and pretty open-minded, so, hit me up, let’s see if this can work. I live in (my neighborhood), it’s a nice area for live music, but want to be part of the mix now, not just a spectator.
Someone told me this is like dating, so, you just have to see who’s out there and try! Willing to invest real time into this if I can find a band to be a part of, we’ve got chemistry, and the willingness to take it further than just playing for fun. But cool to just play for kicks and for knowledge as well.
Tell me about you! What are you into/ what do you want to do with music? What types of musicians are you looking for?
Thanks for reading, best wishes, text or call me, Vik, at (my #), or by email.
(I then posted that pic of myself, same one I use here for my profile pic. Just that one, it’s all I have. Funny thing is, I took that selfie the very first week I got my first bass, Lipstick, that red Schecter. I had no idea what I was doing, and I took the pic just so I’d have something to put on my Bassbuzz profile 
But it’s come in handy!)