Clarke mig welders are a good start, i have a 151te and it's all you would need for a landy pretty much. I got mine from ebay for cheap and spent a small amount on service parts, it's great and easy to use. Don't bother with a buzzbox arc welder as they can be awkward to use and have short duty cycles. You'll need to weld some bulkhead steel at some point so you'll need a mig to do a half tidy job unless your well versed in arc welding. A buzzbox arc can be super cheap tho so if you have no cash it will do a chassis repair ok ish.
Welding is great fun
, your local college may do evening classes? Loads on YouTube as you say but practice makes perfect, use an old car door or something (steel not ally!)
Good luck