Hi,
good advice has been given already... my addition would be the fact that sample variation with scopes does exist and we have seen lemons from all alpha brands on here.
Consequently you want to either test your scope before you buy (and then buy exactly that example you tested - bonus points for getting a discount for buying a demo unit) or buy it from a reputable online dealer with a no questions asked return policy.
Before, you should read up on how to test scope quality - at least by trying a few examples at resolving sufficientlly fine detail (maybe a stamp or dollar bill in a store or far away adverts, car number plates or even birds, if available - outside - avoid testing through store windows unless you want to evaluate the optical quality of the windows.
A better option would be a star test as this allows to eveluate the optical quality of a single instrumen w/o comparing to others. Can be done either with a diy artificial star or a real one - the latter at night only...
See
Star testing telescope optical quality for a short primer on the topic (only the images for tldr - you want two or three concentric circles on either side of focus...) or H.R. Suiter, Star Testing Astronomical Telescopes, Willmann-Bell for the long version.
Ideal conditions for both would be a cool overcast morning or cool and clear night - but avoid seemingly cool summer nights after hot day - lots of heated up stuff (buildings, tarmac, whatever) to spoil the view. Or inside in a unheated / non-aircon room with little or no heat sources - like sunny spots, draped windows with the sun blasting outside or even human bodies.
Regards,
Joachim