trust fund for investment and trading

Before I start trading/investing in shares, I would like to set up a trust fund structure with my wife and perhaps a company as beneficiaries, in order to manage tax obligations effectively. ( I didn't use the minimise word)

My question is, how do I do it spending the least amount?

Rather than pay solicitor costs can this be safley done over the internet and if so, where are the best sites.

Apologies in advance if this is a thread that has been answered before.