custom unit

I'm making a custom civ, and want to give it a custom trait and ability for it's unit. The trait would be +1% science for each unique luxury resource. The ability would be to the knight, where it would gain additional attack power when near other knights. How would I go about doing either of these?

Hello again, adding a custom trait to my Civ is going alright, but I simply can not figure out how to add a custom unit. Each time I compare everything I have to other mods or even the base game it looks okay, but I open the game and when I press start it just says "Loading, please wait." Until...

So I recently uploaded the Portuguese Civilization to the Steam Workshop. Regrettably it is still severely underdeveloped. By that I mean the traits are not unique and it doesn't have any units. Now, experienced modders will get a kick out of this: I have no clue how to add either. You may be...