Well thinking about this now,
when im doing these Kits and Bits (which i will be using until my skills develop as a brewer) should i just keep on boiling it all?
I'd suggest not, for a couple of reasons.
Firstly, liquid extract doesn't need to be boiled, because it's in a can, and therefore sterile. Not sanitary, but sterile. Dry extracts on the other hand are not, and should be boiled.
Secondly, the high gravity in the boil, if all extracts are added at the start, will effect the isomorisation of the hops. Even the late hop additions are meant to contribute some bitterness...the lower bitterness extracted from the late addition hops
may effect the outcome,
depending on what the recipe is. (for the dsga, there is enough base bitterness that I don't think it will effect it
that much.)
Thirdly, if moving into extract brewing or partials, then the boil gravity
does become more important, as you will be doing the bittering addition with hops, instead of relying on the bitterness of the tin. So, imo, it's probably best to start as you mean to continue.
So, with the boil, add any water from the steeping of grain (as this needs to be boiled). Add any dry malt to the boil at a rate of ~100g per Litre. This will give you a boil gravity of around 1040 (which is relevent to point 3, above). Then, just before the end of your boil, add any remaining dry ingredients, and at the end of the boil, add any of the liquid extracts, to disolve it. (if the recipe has no dry ingredients, you could just add some of a tin to your boil at the start, then the rest at the end; unless recipe states otherwise).
the
specifics of your boil gravity aren't hugely relevent to you at this point, and close enough is certainly good enough; but if you start getting in the mindset of paying a little bit more attention to it now, it's not going to hurt, and it will help set you up in the habits you will need if you expand into full extract or partial brewing. Oh, and even at this stage, it will help with consistency if you do the same recipe multiple times, cos you'll be doing it the same way each time. And consistancy is a good thing.