The modpack is designed to be a skyblock. It has a mod that allows you basically get everything out of basically nothing, however I must confess I forgot its name..
There should be a barrel that you can use to make more dirt (its made using 1 halfslab at the bottom and 6 planks to the side if the recipe is still the same)
Use a crook to break leaves from trees, this will increase the chance that it drops silkworms, or whatever they where called. These can be used to infect leaves of trees by right clicking on a leave with it. Once a leaf is infected it will slowly spread to nearby leaves and an infected leaf will drop string. You can also put the silkworms in a furnace to get something you can eat.
You can use the string to make a sieve. This can be used to gain seeds and small stones out of dirt. The small stones can be thrown at mobs or combined to make cobble stone.
By breaking cobblestone with an hammer you get gravel, breaking this with an hammer you get sand and breaking this gives you dust.
You can place dust in a barrel with water (barrels collect water when it rains) to make clay.
Clay+ bonemeal makes porcelain clay, this can be used to make a crucible. By placing a torch underneath a crucible you can melt cobblestone into lava.
You can also use clay to make a bucket, keep in mind this bucket breaks after it is used for lava. Use this bucket to place some lava and water to form a cobble gen.
Gravel, sand and dust can be sieved to go gain ores, among other things (sifting dust also gives bonemeal). You can be a bit more efficient by placing the ores down and breaking them with an hammer until they become the ones dropped by dust as each time you do this it has a chance to give you a bit more out of your ores.
There are automatic ways to sieve and hammer stuff, they however take rf but automating the cobble to ore process is very much recommended.
If you want to have trees grow quicker, I believe it has a mod that will increase saplings grow speed if you repeatedly press shift nearby them.
