Hi Ann,
I had to figure this issue out also. . . .
I researched metal fitting prices and found a couple of places to buy 3-way and 4-way fittings. The local home-box stores did not carry these, but they do have metal 90, 45d and Ts.
For a small frame (one person can move) you will need 6, 3-way fittings. I ordered the size to fit over 2" rigid conduit piping, but you can use 1" also. This I got from home depot, and they will cut it for you. I would buy 10' conduit pipe and have it cut into 3rds (40"ea). These were my leg heights. Next I would have the 10' pipe cut into 5' pieces for the two-side bars and the ridge pole - running front to back. I buy 3/4" self tapping metal screws - slide the pipe into the fitting and secure with screws. You can also drill holes and use bolts, washers and nuts but I didn't.
Now stand under the frame and with your hands over-head lift the ridge pole in the center and walk to the location of choice.
Cover with either treated canvas or plastic tarps. Use washers with your screws, stretch the tarp/canvas and secure with screw+washer.
I've also made larger ones for the sheep and alpaca. 8'x10' the same way - just cut the piping accordingly. I make these the same height and the alpacas just go in and out at the point. These larger ones my daughter and I move together one on each side pole.
To secure them from wind - I attach 2x3s or 2x4s on each side, from front leg to back with bolts. And hang small sacks of sand over these bracing bars (sm bag sand for kiddy sand boxes).
You could buy feet for your poles and then use tent stakes though the holes in them, but this just didn't work well for my situation (hard clay and rock). I've also considered buying elbow fittings and running pipping on the ground from front leg to back on both sides, but with my heavy rain It's easier to keep things up off the ground. Your situation may vary.
You need to decide if you don't want your animals going through the sides or not, if no then tarp the sides to the ground or use wire to block them off. Otherwise the animals will be whacking the wood, pulling the legs out of alinement, etc. With a visual block they only enter and exit out the front, or front and back if you leave those both open.
I use a small frame over my dairy cow's water to shade it 24/7, and a large one for shade in my garden area where I currently have two sows and 14 piglets.
You can also take them apart

for storage or transporting.
Easy to assemble and move - the hardest part was getting a reasonable price for the fittings. Because 3 & 4-way fittings are specifically used to make pole canopies they are usually priced much higher than the other 'standard' size fittings.
I'll snap a few pics and post them later.