new to club!little help needed and hello

hello there im new to biking and have bought an xj 400 diversion and just wanted to clear a few things up, mine has been imported and is a 1993 model with 13k on the clock i paid £400 for the bike and its in good condition and have spend about £300 on repairs is this a fair amount?

im wanting to know if all or most parts from the xj 600 fit as there are no parts really for mine and im after a sports exhaust as it sounds like a sewing machine lol. any help would be greatly aprecciated, i had my cbt/theory done and was ready for my mod 1 but due to stuff happening i havent been on a bike and they have both just ran out so will have to do this again

hello everyone as well