Simple as can be. Most every host has free forum software (I suggest SMF for ease of use & features for a beginner--best of the free ones) then get a hosting account & your domain name and off you go.
No sense sepending money (and being confused) by a powerful & complex forum like vbulletin or Fusion (Fusion would be simpler if you want paid) and phpBB is a lot slower & has more popularity which=more people trying to hack it which=more patches.
GoDaddy is not the place to be (except for domain names) good hosts can be found for less and with better support etc. Some hosts will even support some 3rd party stuff like SMF... with GoDaddy-Nada.
So have fun...and don't start paying a bunch. I had a customer/friend with another website who decided he would do a similar "sportsman's" site for people around this very popular lake where he lived. He got it all tweaked out with current lake levels, fishing reports & everything--really nice forum...and it flopped. I never understood why.
So if he had been on a contract host like GoDaddy and paid for VB or other paid stuffit would have all been money wasted.
But if your forum takes off big-time all hosts (good ones) offer upgrade options and all the forums like VB, Fusion, etc. have importers to automate moving your posts & users from SMF or phpBB...no problems.
You just need a basic but upgradeable hoisting account. With efficient software like SMF you won't outgrow shared until you hit thousands users with 100's on-line at once.
Then you can consider going VPS or dedicated...and remember-unlimited never is,
there's no unlimited anything, you get to big and there will be some fine print to shut you down. But to start I bet your first month you won't use 5-10MB disk space and 1-2GB trasfer. Depending on how popular the forum gets it takes lots of users & posts to even get to 5-10MB and 3-4GB transfer. Then it takes LOTS to grow beyond that to like 1GB storage and 100-500GB transfer. Forums just really don't use up much in resources unless they get really big & lots of people on at once (and lots of photo uploads & such extras)
Happy hunting & have fun