For adding a reaper weapon to a medic, just simply add the reaper's weapon to the Weapon field of the Medic. You also have to add the Attack ability in the Medic's Ability field. And as such, replace the Scan Move button in the Medic's Command Card with the Attack button.
Changing damage, HP, and acceleration are incredibly simple as well. as they just require the modification of a few fields and don't require anything complex.
These simple changes should not even be worth 1 euro. Just ask for help. In my opinion, the only point where you should involve money for your request is when you're commissioning stuff from someone (like having them create a map/model/asset for you).
Consider joining the SC2Mapster discord as well for help: https://discord.com/invite/Jtzt8Su It's a very indispensable resource, as there are hundreds of mapmakers there to help answer your questions, regardless of your experience level.
I have more things to do which are a bit more difficult maybe? I want that friendly Zerg units heal themselves on creep faster instead of having an increased movement speed.
Then I want to add the dropship instead having a medivac. It can look like the medivac, but just without the crosses.
It doesn't have to look like the Broodwar Dropship.
Some help would be cool, because I also want to save some time what is the money mainly for.
But thanks for your help so far.
Acutally I try to add the dropship to the starport, but I don't know which dependencies I have to add to get the best normal version of the dropship, where all things work fine? Animations, command card buttons etc.
And I try to morph the Viking between its two modes while moving. That is more complicated stuff I definitely need help for.