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@graeme_the_bike_tech
Make sure (if you want to TIG) that the tube set is specc'd for it - some materials don't take at all kindly to the very localised, high temps of TIG (or any other kind of welding).
If you are lug-building, you'll need to silver-solder or braze. Silver solder is safeset as it's lowest temperature, but you have to buy good quality, high siver rod - the cheap stuff doesn't run so well. Brass brazing is higher temp (you have to be careful not to overdo it and so weaken the tube) but it's lot cheaper in rod material.
Use good flux - a lot of builders try and save money on rod & flux and it costs them in poor joint integrity in the end.
In both cases (TIG and lugged) you'll need to mitre the tubes to one another accurately, but if you whizz over to frameforum.net, there are a bunch of guys who can help with providing templates for that.