I was on Roaccutane many years ago and it worked wonders on my very stubborn acne, which has never returned. I do remember having a lot of cool showers when my skin felt a bit itchy, so worth it though.
First if you wear SPF or full make up you should cleanse it off by double cleansing.
First cleanse is to remove the spf / make up and second cleanse it to clean your skin.
I like bioderma micellar for my first cleanse as I find it gentle and effective. As you have acne I would avoid any heavy oil based removers (they'll be fine once your skin clears up) My skin is very fussy with cleansers. (quite often though in the evenings if I'm tired I find my skin is quite happy with just using the Bioderma as I use it till the pads are clear)
For a second cleanse and morning cleanse in the shower, there are many out there, I like Dermalogica special cleansing gel. The bottle is 250ml and lasts for ages as you only need a small amount. (I buy mine directly from their website). You could use this as a first and a second cleanse ie wash your face twice with this product in the evenings. You can also try Neutrogena hydro boost gel cleanser.
As for SPF I like ultrasun face (can buy this anywhere) and Frezyderm ( I bought from Amazon, dont use this under foundation though as too silicone) - I use 30 spf as I find 50 spf never agrees with my skin.
For moisturiser I often just use Superdrug Simply Pure hydrating serum on its own.
My skin is a bit awkward with moisturisers and hates most of them. It likes origins ginseng gel and Clinique moisture surge. It also likes Dermalogica skin smoothing moisturiser. You can also try Neutrogena hydro boost moisturiser.
If you dont like the sound of any of the above then try products by La Roche Posay and Vichy which you can buy in Boots.
Have a good read up on the snail threads on here in S&B. They are very knowledgeable.
As for foundation I like Lancome - teint idole or Clarins - everlasting and CYO - lifeproof long-lasting which is brilliant for the price.
My DS and DD use clearasil ultra facewash and Neutrogena clear and defend face wash. Neither of which dry our skin out at all. They also use the clearasil ultra rapid wipes esp my DS. This may be too strong for you?!? I dont know.