H3 commercial for you. 2.1/2.15 thickness 39-40 hardness
If you like it and adjusted to this kind of rubber you can "upgrade" to provincial or national depending on your budget.
Color: orange is easier to getting used to. Blue is more lively and requires nearly perfect technique. It is quite unforgivable of you hit a shitty stroke.
Booster: this is mostly personal preference. Buy what you can get your hands on. Everyone will tell you smth different which is the best booster. The only real difference a noticed is the longevity and the reaction.
For example: you need usually more layers of haifu than tempo long booster. But haifu is more forgiving and less aggressive. If you **** up with tlb you gonna have a Rubber which will never undome and probably bubble the moment you hit a ball.
So just buy what you get your hands on.
Your glue example is fine. I personally use dhs no 15 which is quite thick and pretty strong. Both characteristics are quite important otherwise you wouldnt get your rubber unto the blade if the rubber is still domed.
The rest was already answered in your thread.
In general boosting requires some experience with it. So you wont have the best result immediatly. Just go for 2-3 layers and adjust the next time.
Remember, boosting softens the sponge and gives the rubber the little bit of tensor feeling you probably know from your dignics. Just a little bit different.
And never boost too much, otherwise you damage the sponge and probably the rubber too, so you wont be able to use it for long and it is gonna feel mushy and unreliable.