If you have "scratchy eyes" after welding using the Auto Darkening glass, look at adding a +2 gel filter behing the glass (inside). It can help a lot. Also wear a decent filter mask that is designed to filter out metals
(lead, Moly, etc) these can be found at any welding supply house or on line. Be really careful when welding Galvanized metal. Google "metal madness" and be VERY aware about what you use to clean the weld area before welding...there was a pot here a few years ago by a guy who accidently used Carb cleaner to opre clean a piece and did not get it all cleaned off. When he began to weld he hit a pit where there was a small amount of residue and woke up 10 min later with serious nerve damage and lung damage (the carb cleaner chemical became phozgene gas when exposed to the arc and he suffered serious damage to his brain and nerves).

Rig up a fan to suck the smoke away from the work area. Set up plywood panels as spark shields (you would be amazed at how far weld sparks can fly). and above all DO NOT EVER WELD WEARING ANY POLYESTER/NYLON! COTTON/WOOL OR LEATHER IS THE SAFEST CLOTHING TO WELD IN! Gaulnlet gloves, boots and a turtleneck shirt and hood. Nomex gear is cheaper than 3rd degree burns. If you cannot afford Nomex, take a heavy canvas shirt and soak it in a heavy Boric Acid and Water mix and let it dry well. This will suppress 90% of spark fires on your clothing. Frayed jeans catch like tinder so don't wear ragged stuff.

Seriously I've worked around welders for years and am a CWI/ICC S2 Wedling Inspector and have seen guys pants/shirts catch on fire from small sparks that do a U Turn in air and go down between the neck and shirt.

Also contact Lincoln Welding on line, they have a lot of FREE info on welding techniques and suggestions as well as safety info.

Be safe and work safe!