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https://minecraft.curseforge.com/projects/modern-skyblock-2
My base started with a snow island.
I had bad luck with the wood island (the only sapling I could get was a single dark oak one, which is not enough)
And I failed so hard at the sand one that I didn't even get to make a sapling.
You can also start with a normal dirt island. Pressing G is your friend in the beginning together with the quests, it tells you everything you need to know, and a mob farm is very important as you will need a good bit of rotten flesh and gunpowder.
It also isn't a sieve fest like I know other sky block packs are. There isn't even a sieve
Oh, and witches don't drop or pretty much never drop redstone, so don't bother trying to get it from them and instead try to upgrade your combustion thing so you can make it.
And don't rely on the machine that I made to get metals, even in you have it running 24/7 the drop rates for metals are very, very low. So invest in at least semi automating the other way to get metals. You will be using that anyway for a long time before you can even get the resources to make that thing.