All good stuff but size matters
Clecos, Cleco pliers are tool #1. You can't have enough of either. They do wear out. I have about 5 or 6 cleco pliers. I miss place them and always have a few extras around.
The drills and countersinks might be too large to use.
Deburr tool is that, it deburss an edge of sheet metal. The blades wear out and this is a useful tool if its sharp. I like ones with long handles at 90 degrees.
The
"Not Sure" are cool back deburring tools. You pop through a blind hole you can't get to and deburr the back side, I believe. It looks too large to use and frankly we don't have too many holes you can't deburr both sides before assembly.
MOST RV HOLES in a RV are for 3/32" rivets (#40 drill) and 1/8" rivets (#30 drill). There are other sizes but these are most of the holes.
The
"plastic plug thing" is a drill guide. With a hand drill you get good drilling perpendicular. Also when dilling through 0.032" sheet metal you can't make the hole too crooked. These drill guides come with custom sizes bushings. I have a few and use them. However if you want a straight HOLE..... do it on the drill press. When drilling thick items you do want to be straight because a wondering angled hole is not pretty.
You will need to buy new quality tools, dimple dies, lots of #30, #40 drill bits & counter sinks and $1000 worth or more. Check out
Cleaveland Tools. I'd buy dimple dies from Cleaveland. If you buy cheap ones, they bugger up the dimples or are not pretty. Best advice DONT BUY CHEAP TOOLS. You might get by some places but it usually bites you. If it touches the metal, like dimple dies or fluting pliers, pay the money and get quality. Look at the tool kits cleaveland sells. You don't have to buy a tool kit, but it will give you an idea of what is available. As you get started you will see what you need. There is nothing wrong with buying tools as you need them. Eventually you will have 75% or 80% of one of those deluxe tool kits.
Do get a real, good compressor (not a oil-less Sears) and air-tools at min are drill and rivet gun, rivet dies and bucking bars. I like a 2X gun, some like a 3X gun. Again the don't go cheap rule rules with these basic tools you will use 100% from start to finish. Check out the cleaveland
"get me started kit". (A rivet squeezer is not a must, but once you use one you won't go back.) Again I can't tell you how nickle and dime-ing for cheap tools will bite you. Trust me I learned as a registered cheap-skate not to cheap out on tools. Check Cleaveland tools
FAQ & Videos. You can buy tools any place you want (except dimple dies get them at Cleaveland). The Cleaveland folks built an award winning RV and you'll not get junk there. However do comparative shop, make sure you are getting apples for apples or apples.
ATS is OK, but they mix up some el-cheapo stuff with good stuff. It's been a long time since I bought from ATS and was not happy, but things may have changed. Don't get overwhelmed with tools, you will know what you need when you needed it. Power tool wise a drill press and bandsaw are on the top of the nice to have list.