Go out, clutch kick and have fun
Its pointless giving you pointers as when you first start drifting, you will panic and forget what we told you lol.
Take as many tyres as you can
Only pointers I would give, is if you spin out and travel backwards, pull the handbrake, it stops you faster and take as many tyres as possible.
As for mods, my mate has a stock 1.8 mx5 and it skids alot better than i thought it would. As long as it already has a decent lsd, id work on the suspension, try and stiffen it up with some shocks, springs and anti roll bars.