Hello Paulo,
For the guns, you can see my message on the post about Nemrod News in main page, answering to a question of Robert C33. There is the drawing of a gun Gribeauval system, used from Revolutionary wars to the end of the Empire and more.
The common guns used by French Artillery were of three types:
Campaign guns caliber 4,8 and 12.
Siege/castle guns caliber 12,16 and 24.
Howitzers short barrelled guns caliber 6 and 8 pouches
Concerning the uniforms of french artillery, I need a detail, rather important: foot artillery or horse artillery?
Foot artillery had an uniform very similar to the infantry of that period, but almost entirely dark blue, with red piping on the collar and lapels. Red cuffs (dark blue strapped) and turnbacks, blue grenades on the turnbacks. Dark blue trousers, black gaiters in winter, white in summer. Short black bicorne hat with red feather.
The horse artillery had an uniform similar to the hussars, a dark blue dolman, with eighteen red braids on three rows of buttons, partially covered by a red and d/blue waist sash. Red piping on collar, red pointed cuffs. Dark blue trousers (with black, edged red, boots) or dark blue campaign trousers black skin reinforced inside. Black mirliton shako, with a red cloth wrapped around.
If you specify what artillery you are looking for, I'll put on line some pics.
Regards
MdM