There are many networks out there, with many different services. You just have to try one and check it out
You can open your mIRC, press
Alt + O and go to Connect > Servers (left side) - you will find many networks there! Yes, some are more reliable than others, but that is mostly a matter of opinion (except when it comes to DDoS attacks, I belive, since most ppl dont like them)
To find out about registering a channel, go to the #help channel of that network and ask if they have Channel Registering services. As an @Operator you can.
if you wish to set a limit to the channel. The syntax of the code is:
/mode #channel_name +l N with N as the limit number.
Edit: wow Mentality, you sure type fast!
Hope this helps!
Zyzzy.
