Hi and Welcome to Ribnet! See this type of post quite a bit,and the thing that springs to mind always..being a 'Newbie' is you still have a bit of research to do..
There is ALOT of difference between a 5M and 7M Boat..apart from the Handling..and Price-capabilitys- Towing Storage Running/Maintainance costs ect,Pluss the fact you have'nt expressed a preference for type of Engine-Just..'Inboard or Outboard'Layout-Sports or Liesure ect..ect or Budget! suggests you need to do get some hands on, see what YOU want from your Boating and take it from there!!
Dont want to pour water on your wine but...(Unless your a Scammer..trying your luck)But It always pays! There is plenty of good advice on here to help,Good Luck!