the one good thing about your age is that your likely to put in 15 years of work, a lot of other age groups will be more flightly than someone of your age. Also a lot of schools dont really like having younger techs, its hard enough getting teachers to respect a tech let alone when the tech is nearer the age of the students.
in terms of pay i'd look at more than take home if you can, when i was looking i found the nicer jobs with better opportunities had smaller wages.
congrats on your qualifications as well, on paper your there or there abouts for most tech jobs, a little experience and you'll be ready to compete for the best jobs.
good luck although i'm sure you wont need it