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GPA said..
7'2" - 7'6" for learning - then keep it as a summer fun board for the smaller days (or loaning to a friend wanting to learn).
Once you can take off and trim every wave you go for, then you can start looking for a 6'6"' on your way down to a 6'2" and smaller (depends on many, many factors, including width, plan shape, volume, your fitness and the waves you surf).
I reckon thats bang on...
Or Anaconda have a 7"0 foamy which is decent on sale for like $140 or an 8"0 for $160... ride it till your trimming then decide if your a cruiser and want a nice middy egg in the mid-low 7ft range or want to move up to a log to NR around 9'4"-9'6" or move down to an sb to rip...
Either way, find the old dude who surfs great and knows the local, make friends, listen, take particular note of lineup etiquette or, get a few private lessons and you'll progress much faster