Dazza: I'm not going to offer my two bits worth as to whether or not you should form a company. But I do recommend a separate bank a/c for your investing/trading activities. Years ago, when I got into serious stockmarket activity, I opened a Macquarie Gilt Edge Access a/c and have never regretted it. You get a cheque book and they pay interest on the credit balance, with no minimum threshold. What I particularly like is the provision in the front of the cheque book of a record of transactions - you can enter details
of every cheque you write and every deposit - every buy or sell. It's wonderfully simple and efficient especially for a simpleton like me. I use the GEA a/c solely for my investing, using WBC cheque accounts for all other income/expenditure. It's often convenient, but not obligatory, to use Macquarie Equities as a broker.
They're not paying me to say this!
Good on you, Dazza, for starting early. Good luck.