Is this the way to go with muscle building?

Hi, this last week i've joined the gym and been heavily researching on the Sport, the Diets etc and i think ive got a solid plan but i want confirmation so that it works. Im an 18 Year old guy standing at 6ft 5 (195cm) and weigh ~86kg, im looking to put on muscle without adding too much fat (i know its not gonna be no fat but minimal would be best so i dont have to cut as long) Im training 4 days a week as of next week (last week went 3 to introduce myself) doing a split routine and 5x5 training with warmup sets. I've worked out about 4000 calories a day to gain maybe 400 less on rest days depending on how busy I am, but my total exercise is the gym + walking to and from class/work, and work is walking roughly 2-3 hours solid. Ive built up a diet that is pretty clean and ive stuck to it perfectly past week, it includes Oatmeal,LF Yoghurt, Wholemeal Toast, Chicken, Lean Red Meat, Salmon, Brown Rice, Potatoes, large amounts of vegetables, Whey Protein, Skim Milk, Peanut Butter, Avocado's, Bananas, and some Powerade some days while i train. Im fairly confident this is a clean diet and i have split my eating up into 6-7 times daily 3 big meals (BF,Lunch,Din) and 3 smaller meals (pre/post w/o, pre bed, snacks). if i continue with this should i see some lean mass gains? Cheers peeps :) P.S. is it okay to have the occasional cheat meal if im out with friends, so long as i try to keep the fatty foods out etc ill have subway or nandos or sumthing rather than macdonalds which i dont really eat anyway (maccas, hj's are a huge turn off for me)