Any tips for my audio setup?

I wanted to ask a question. So currently my home recording studio is in my bedroom, i'm looking for tips to make my audio sound better and to take that next step in my career. My equipment is: 1. Audio Technica AT2035 condenser microphone 2. Sterling Audio PHP1 Phantom Power Supply 3. Audio Technica ATH-M30x Headphones 4. IPhone Se 5. Very messy bedroom I'm 15 so I do not have the best income. Any tips on my setup? Any tips on what I should do and buy?

Career? You are a kid with stuff in a messy bedroom. Define a work space and KEEP IT CLEAN. The quality of reflective and absorbent surfaces in your room is a factor. You need education FAR beyond what you have. My adult son has his Masters degree in Digital Music and Composition, and still tells me that every day and every job, he learns something. What are you working on? Do you actually expect to record good, live musicians in your messy bedroom?

Sorry but you just about need to start from scratch…

You need a PC (or reasonable laptop) of some sort to do any serious work. Software is not a problem - Tracktion 6 is completely free and unrestricted. https://www.tracktion.com/products/t6-daw

You need a decent USB Audio MIDI Interface; a Focusrite Scarlett is a good choice, eg. A 2i4 or 6i6.
Examples:
http://www.ebay.co.uk/...2462518921
http://www.ebay.co.uk/...2733552178
Ignore any demo / lite / restricted software if anything like that comes with an interface; it only exists to try and get you to spend too much money.

[ps. Do not get a "mixer" that has a computer connection - they are common and cheap but for totally different applications].

You do not need a phantom power supply; any decent interface will have phantom power capability.

With the PC, software and interface you can do multi-track recording of instruments, vocals, keyboards etc., including playing some back while recording others - you need your headphones there.
Also by using VST plugins you can create rhythm tracks or use samplers, sequencers, synthesisers etc. And there are thousands of free VSTs.

Unfortunately you have got caught out in a common scam with the microphone - the AT20xx are electret mics, not true condenser mics. It's not bad, but way overpriced. You can get true condenser ones cheaper.
(The full name of an electret mic is "Electret condenser microphone", however they are a very different thing to a true externally polarised condenser capsule - but many sellers list electrets as condenser microphones).

Unless you have "studio" conditions with zero background noise and an acoustically dead area, you are likely better off with a stage mic such as a Shure SM58. They are designed to be used as close as possible to your mouth, giving maximum level to the wanted audio so minimal background by comparison.

If you really want a true condenser type, the MXL ones are best value - look up these on ebay for examples:
MXL V67g
MXL 990
MXL V87

The first two are lowish price ones and fairly good, the third is more expensive but really excellent.

First, Clean Up Your Room.

Then, learn what people who HAVE careers use and start acquiring those things.

If you are using your phone as a recorder, that's the first thing to replace.

To get a good start, I would probably buy a Tascam DP-006 or DP-008.