What you need is an insurance quote (for a reality check), to place a classified ad (or two) to unload your current shed and then a budget to go out and buy a better starting base.
Like maybe a G3 16V GTI.
Then you could spend some time learning to drive with 150-170bhp, rather than launching yourself on a probably badly-set-up (on £150 pogo-sticks), poorly assembled, over-powered hedge-seeking missile.
I know it sounds harsh (as normal), but it's your first project, isn't it? Going for a 20VT conversion at 19, straight from a 1.4 wet-blanket seems like a large and foolish step and a way of damaging both your health and your bank balance in one almighty tree-shaped BANG.