The fact that your worried people won't like you means you will put your all on and they will like you!
If your not good at admin get someone who is if there will be fees
Start a website or Facebook page
About the club
Set out a timetable on a calendar
Put a pic of yourself with a little thing about who you are and what you want to achieve ! Like you have done on your POST here but maybe more PC (everyone gets offended by everything these days)
If there are fees explain what it's for such as insurance
Could even show routes on google maps on your page so people get an idea of where they will be going each session
I don't know where in the world you are but as it's for fun perhaps you could do more scenic rides and have that as the USP. And show where they are are the tour maps. Even have stopping points maybe ?
You could go as far as having club t shirts - very cheap ones like for £5 and then other merchandise but of course that's for the future
Could make a playlist that fits the route that you could send to attendees beforehand so you have the same music to listen to while you go - course this is dependant as some people won't want music due to safety etc and others would just want their own
Send out a weekly newsletter - probably best online these days just a quick post saying ' well done everyone this week, we did 'X' route it was amazing please add your pics that you have taken on this route and tag the club
Rider of the week - could be someone who's gone further than usual or faster or even someone who's confidence has been good that week or was encouraging other people up
Welcome rider of the week - put a post up ( with their permission) welcoming them to the club for newbies
Have a WhatsApp group once you all get to know eachother
Arrange a meal out every 4 months or so
Once you get a group together could even think of a tour away once a year for fun and raise money for a charity or one of the riders kids school or something
Promote your club and yourself on tik tok and Instagram aswel as Facebook
Maybe make flyers for local shops etc
Wish you luck