always sharpen a brand new pair
tboy and
yesguy make good points...with cheap skates it never fails...the blade and rivets always loosen which could be quite dangerous (hate to break my ankle to save a few bucks! LOL) and the boot usually is'nt to comfortable...and remember ,when you buy a good skate, the boot will last and get better and more comfortable with age...you can always replace the tuck and blade.
I only snug my top 3 laces ,mind you my foot is a double E...that's another thing, make sure you get the proper width...make sure to have your foot measured properly to ensure a properly fitted skate. ..... btw you can spend anywhere from $100 - $900 on a skate nowadays lol
If your planning on doing alot of skating purchase a good pair of skates , spend the money ,they will last you a long long time. If the toe is'nt coated already I suggest buying some toe guard and doing it yourself at home....almost like painting your sweeties toe nails LOL

...also pick up a stone....good to take burrs off in the dressing room or on the bench.
NAtional Sports does an ok job but it's always good to find a good rink guy! ...those rink guys sharpen ALOT of skates ....they get pretty good at it! lol
what area of T.O are you in? ...I might be able to point ya in the right direction.