hi lara.... i actually have some retin a on my face right now 
first i clean my skin, then tone... wait a minute or two, then put on retin a... don't put a ton on... you want in to seep into your skin.
the thing w/ moisturizer that is adds oil/water to your skin and retin a drys your skin so i dont really see the sense in putting on moisturizer wehn you're putting on retin a...i have moisturizer but i dont use because i use retin a and i think my skin looks better when i do this

first i clean my skin, then tone... wait a minute or two, then put on retin a... don't put a ton on... you want in to seep into your skin.
the thing w/ moisturizer that is adds oil/water to your skin and retin a drys your skin so i dont really see the sense in putting on moisturizer wehn you're putting on retin a...i have moisturizer but i dont use because i use retin a and i think my skin looks better when i do this