Hi Suzi,
Well, you asked for advice, so here is my two pennyworth
For some supplies & instruments places such as:
http://www.beautyexpress.co.uk/index.html used to be a lot cheaper but are now catching up. Quality may not be ultra ultra but its acceptable.
For dom cases, try aluminium tool cases from places like B & Q or photo shops like Jessops. 20 to 30 pounds or so.
For gloves and consumables somewhere like
http://www.nu-careproducts.co.uk is quite good, use them myself.
And think safe. Always take names, address and phone of where you are going and leave a full list with someone else. If you feel 'wrong' about a 'dom' either before or when you get there, play safe, don't go.
Good idea to link up with a local surgery based Pod to refer your nail and soft tissue surgery cases to and a Pod Surg' for your bone surgery etc. Don't be afraid of losing patients by referral, the Pt's always equate you, the referrer, as the start of them getting better.
Don't try and compete with people who are charging silly prices for 'pin money' if you want to earn a fair living and enough to re-invest in equipment, charge mid to upper prices for your services. Its easy to be a busy fool.
I'll send you a link to my practice website as a private message. It may give you a few idea's. Last time I put open e. mail addresses on a forum (to be fair, not this one) I had so much spam my mailbox nearly gave up. Including some that definately should not be sent to a middle aged man. Talk about shocked!.
Good luck!
Martin