There are lots of ways to make a walkway. Some cost more than others, some suit a home better than others.Also, amount of traffic to the particular door makes for physical requirement criteria as well. And you can't rule out resale value. Expense is a practical issue as well.There are too many unanswered variables for someone to say -"do this"

A photo would help at least start you out by getting suggestions that fit the aesthetics of the house as a place to start. Then you can make decisions on your own values and tastes without going through the exercise of sharing the details through words.

Yes a pic would be more helpful.

The front walkway is the most important one, so go big ticket on that as a choice and lower on the backyard.

Walkways laid on packed gravel or sand are well inside the DIY zone.

How good are your knees?

Regardless of what material you choose for the walk there are other important considerations. The position of house, drive, and walk often lead to an enclosed area. Roof water from downspouts and rainfall on the area may need to be discharged to another area. Low voltage electrical cables for lighting may need to be installed into or out of the enclosed area. This also applies to water lines for such things as a sprinkler system.

To facilitate all of these possible future uses, before walk construction you should install underground pipe sleeves under where the walk will go in appropriate sizes. Should you later need to route utilities or drainage pass the walk they can be run through the existing pipe and the walk need not be disturbed

Short lengths of plastic pipe are cheap. Cap off the ends, bury under where the walk will go, and keep careful records of where the pipes are. Putting a line into or out of an enclosed area without sleeves can be expensive and result in damage to the walk.