what do u mean by a "1/4 strength mix"? Like 1/4 what u would regularly feed the plant?

Also here are the actual pics of the plant
[attachment=o67372]
[attachment=o67373]

Im thinking about starting the flowering process in about a week or so, in terms of nutes any steps i should take? Sorry about all these questions, are there any good FAQs about general nutes for indoor grow? thanks