Hi,
Forums are tricky. Very tricky. Though, I love them to the death

.. and I actually have a bunch of dead forums..
Advice: if you can > buy a forum instead of creating one from point "0". As long as a forum has 100 real users > it will be a huge game changer.
DNForum and Acorn Domains (I bought both of them) > both run on Xenforo. DNF has a dedicated server and Acorn is on Cloud (one of the big ones).
As for the free ones, my top choices would be:
1) Simple Machines Forum. My sample:
https://www.maria.zone (a forum I keep for Maria ecosystem sites). The forum does have eyeballs, though almost no interaction (even despite the fact that $Maria coin has quite a lot of users).
2) Flarum. My sample:
https://www.zenzoforum.com (a fun forum I created for a $Zenzo community when they lost their website.. shortly after the forum was up > the team restored the website and the community is almost never there, and at discord instead).
3) phpBB. I did have couple forums on phpBB - very good forum engine. + lots of themes are available at ThemeForest.
.. as for WordPress and BBpress > just stay away. Years ago I bought a dead forum (had been closed for couple years) ibf.lv (internet business forum > for a small European country Latvia.. I am originally from Latvia), and migrated the old data to bbPress.. I wish I never did that.. even users who like forums, didn't like the WP login.. it just doesn't seem like a professional forum. .. >>
https://www.ibf.lv/visas-foruma-kategorijas/
.. I could fix it, but Domain Summit has become my main priority now. At some point will migrate it to Simple Machines Forum (SMF).
The newest forum I have just launched is also on SMF:
>> Domain name forum for the French community
https://www.domaineforum.fr 
.. of yes

I do plan to do some work for this one

.. especially as I have some great connections with French domainer community
The main obstable starting a forum > you need a community and the community must have a number of benefits why they are there.
Benefits at being at DNForum:
1) Possibility to find buyers for names for liqudation and wholesale price
2) Networking
3) For businesses: ability to advertise their brand to the domain name industry (hugely restricted at NamePros)
4) Backlinks
5) Making your name and getting IT service related gig orders, or finding reputable users who can do that
6) For businesses: to monitor what real users (mostly: pros) are thinking of their brand and impacting thoughts
7) Industry news
.. and the old good one: just chatting
About Xenforo: both
https://dn.ca/ (by
@MapleDots) and Geman
https://domainfragen.de/ > both run on Xenforo.
+ German DomainFragen.de is the proof that it is never too late to start.
As for the name > go for the main keywords in the name + also try to keen it short
Does this help?
Don't be afraid > go for it!! Yes, the death rate of new forums is sky-high, but, possible rewards are also!!
Best wishes!
Helmuts
p.s. .. let us see what
@MapleDots will add .. I am curious
p.p.s. I also have an extensive history of forums that never worked out. Don't allow failures of other discorage you > Do It and tell me in London how it is going!! .. in the worst scenario > I might buy it