The no scar and underwear removal mods would be good choices as they're both immediately noticeable. Once you know how to merge two mods, then you know how to merge as many as you need.
Now take your merged game_main.arc and drop it in the game's directory. Once you've got everything in there, use the arctool to repack the game_main.arc. Repeat for every mod (ensuring the modified files are all being placed in the 'base' game_main.arc from the previous step). Go to your primary game_main.arc (Either pick the game_main.arc from one of your mods as your base or copy the original game_main.arc from the game's directory and extract it) then copy the modified files into it. Leveling up in any game can be a grind, it's a chore that takes more and more time with each level. For players wanting to create a beast of a character, there's a mod that will help. Go to the location of those files in the mod's extracted game_main.arc and copy those files. 15 Best Mods For Dragon’s Dogma 15 Adjusted Stats From Leveling Up. Check the mod page to find out which files that mod changes.
Put each mod in a separate folder, use the arctool to extract the game_main.arc file for each mod in its own folder.