Welcome to MTF!
Blades. You are going to need to examine your current mowing habits because the blades are a main part of it.
Do you try to cut the grass in the least amount of time?
Do you really care how the mowed area appears?
Do you have the time and resources for disposal of bagged clippings?
The blades that come with most mowers are designed for side discharge. That is, that as you are cutting the grass, the discharge is sent out in a stream usually on the right side of the mower. If you are happy with that, just continue on.
Next up is bagging that discharge. Usually, high lift blades increase the force to send those clippings in the bag(s) or container(s). There are also powered assist devices to help throw the clippings into the bins. You mow until the bins are close to full, then stop and empty them before continuing on the mow. What you do with the clippings is up to you as they do have many uses, but most just get tossed in a landfill eventually.
Mulching is a wholly different animal and does require more than just the blades to work properly. Mulching blades have additional surfaces that cut the clippings into smaller pieces when allowed the time. Mulching blades can be used with either side discharge or bagging, but the results are less than the full blown mulching. Setting up the deck to take full advantage of mulching requires one to seal the deck to prevent side discharge. Baffles can be installed inside the deck so that each blade cuts it's own section. The blades then cut the clippings into much smaller pieces which are deposited in the mowed area. You have to allow the time needed for the mulching blades to cut the clippings several times or you get windrows of grass left behind. These windrows can be swept up with a sweeper, but you run into the same problem as with bagging: What to do with the clippings? With a full mulching set up, one cannot see the tiny pieces of clippings left behind. These tiny pieces decompose much faster adding nutrients to the area.
Let us know what you end up with.