DON'T BUY MORE THAN YOU NEED
On a strict budget; starting out; booked to do a course?
Second Hand D3100, apox £150 delivered from a reputable 2nd hand daler.
Nikon 35mm f1.8 AF 'prime', aprox £90-100 delivered from reputable 2nd hand dealer or about £150 brand new from one of the greys, eg: Value Basket. A 'fast' SD card, eg 45Mb/s, aroud 16Mega-Bytes ought to be enough, and costs about £10 off e-bay.
THAT, is actually the outfit I put together earlier this year for my daughter to finish her O-Level photography and do her A next year; all you need for under £300, and it'll be a LONG time before you need to make any serious upgrades.
AS you start to use that set-up, as you start to learn stuff on your course, you are likely to want to build on that 'core', and probably the first thing you will want is a tripod; then spare batteries and more SD cards; then depending which way you go from there, what you might add to the kit will start to be directed by what you are doing; for studio work, you are likely to want off camera flash and trigger sets; for landscapes; possibly a wide angle zoom, say a 10-20. For nature or sports, you are likely to want a longer telephoto zoom; for 'walk-about' photography something with a wider range than the 18-55, an 18-105 perhaps. It ALL depends.
The 18-55 is a very good, very versatile, and great value for money lens; but it is a compromise for 'consumer' cameras. As such, mine is probably my most used lens, but its ALWAYS lacking 'just' something; and for academic exercises likely to be set on your course, the 35mm/f1.8 is compromised only by lack of the 18-55's (relatively limited) zoom, but gives you a brighter view-finder, and that very fast aperture for low light and shallow depth of focus; it'll help you do 'more' without buying other lenses so soon, and for the teaching, it's limitations will more quickly get you 'learning' and learning better what you REALLY need to do the stuff you want to.
D3100? Does't have the sensor resolution of the 3200 or 3300, otherwise that's about all it lacks. Very good value for money body 2nd hand at the moment. Lower sensor res is little or no impediment; daughter is doing well enough with it's 'lowly' 16Mpix or whatever it is, for O-Level submissions printed up to A2 size; while smaller file sizes effectively make the SD card bigger, and the camera and card 'faster' not processing so much data.
Meanwhile; as you evolve your 'kit'; you will most likely want more lenses first; old fashioned mechanical devices, these don't 'date' or devalue like stuff in silicon, ad you can carry them over to 'better' bodies later, provided you stick to APS size sensor Nkon's, or buy strategically for 'full-frame' if you see yourself ever gong that way.. but either way; even if you completely change system, say go Canon, or MFT, or cash out completely.. A lot of the cash value will remain in them... it WONT in a body.. certainly not a brand new one. At £130ish a D3100 can 'almost' be treated as disposable; if you bought a D3300 today and tried trading it in tomorrow you'd likely loose more on the trade in price; while in the mean-time, you are going to be taking a LOT of photo's, clocking a big 'shutter count', taking lots and lots of 'duff' photo's by accident or on purpose, doing your course exercises and experimenting and practising, and the camera wont be stopping you do anything you need or want to along the way; so keep the cash the bank towards stuff that you are more likely to find more useful as you start to discover what you can do, what you like to do, what you what to do, and what you really need to do it.
