Free trials can't be bad.... but if you have friends that use an Editor, try their Software first.... it's very confusing having several Trials.
Trying to mix stills and movies isn't easy - our brains prefer movies prob. because it's more life-like. However, stills can convey great detail esp. if you zoom in ( effected in Edit ) and provided the original has plenty of pixels you can zoom-lots..... but as with many things you need to have a storyline to pull it off well. This usually means:- trying/planning/trying again....
If yr camera is in a fixed position (e.g. tripod) then you can make fab time-lapse like fleeting clouds, or boat action in a harbour ( from the clifftops) which are easier to see when speeded up. This is a very good use of stills. However, you need ~25 per second, so be prepared to take quite a few - the Software will stitch them into a few seconds of movie.
Of course, if these are Family pics, - then they will be very forgiving as Family pics are v.close to them.
Good luck.