@novorapidboi26 has hit the nail on the head here.
It's often said that people are more likely to succeed in a pursuit when part of a group. So you may find something like Slimming World to give you that extra push that you may (or may not) need. I've never been so can't comment first hand, however some family members swear by it.
If you feel that you're determined enough to do this solo, then there would be no need to join a club. There is more than enough advice and guidance (from trustworthy sources) online to keep you right. This site is one of them

You'd also avoid having to pay for that advice as well...
If you'd like to meet other like minded folks in person, then a club would be the way to go for you.
Good luck in your endeavours!
Grant