Are there any specific times when the plane is out for drops or the plane drop crates at random timings. I want to try a fun game where I want to only hunt and get those drops
Crate drop timings
playerunknowns-battlegrounds
Related Solutions
There may just be coincidences with a lot of people having similar gear. I often see the same stuff because people aim to get the better gear and obviously level 3 gear will be the most benefit to you. The places with higher loot spawns, and better gear tend to have a high percentage of players dropping at so it's not unlikely you'll see a lot of players with that better gear.
As far as I known in my time playing, and from reading forums and threads about loot spawning, there doesn't seem to be any particular weight applied to certain things spawning in different matches.
Common loadouts are ARs with a shotgun or SMG, in my experience, which is why they're so commonly seen. The more powerful guns have less frequency so that also contributes to seeing more SMGs around the place.
Some early threads like these all mention how it's weighted towards certain zones having better loot, and the farther away you are from them, the more RNG is factoring in. In my experience the more isolated places tend to have some things in them, and a variety of gear, but there is the chance nothing/little amounts of things are there.
If you check out various loot spawn guides like this or this, they'll tell you that you're guaranteed better things at places like the Military Base, the School, or the Power Plant to name a few.
Here is an image which shows the general distribution, and as you can see, some places are much more weighted in the amount/quality of loot spawned. 
Sadly there is no "practice mode" available to the public yet, although there are custom matches.
In order to create a custom match you must be verified by PlayerUnknown, which will most likely only happen if you are either a streamer or company that would promote the game.
You can join a custom match by clicking on "custom match" after hovering over the play butten in the top right. Custom matches do not count towards your rank so it doesn't matter if you die right away while you're testing your fps. Even after you die you can still spectate the players and test your PCs performance that way.
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Best Answer
Airdrop timings are somewhat random, there is no guaranteed time to get a drop and no way to predict what time it will be before it happens.
The best way to get a game in which you get all the drops is to simply grab a bike and chase them all.
There is a slight prediction you can do, in that the first drop will always be in the play area, and each subsequent drop must fall at least within the blue circle.