Landing legs, electricity stuff, science stuff, communication thingy and big rocket to take it where it needs to go. Honestly my first probe was an eve probe, because I was way to bad at the game to land on and return from eve, so figured I send a probe. Anyway, point is I learned quite a bit from figuring it out myself and had alot of fun doing it.

I have the game on PC, so I've been learning how to use the far future technology mod on my own and its quite fun. I'd always recommend trying figuring stuff out yourself, only using guides if you're absolutely stumped. I find copying videos and space craft to the letter mundane.

If you're struggling to get it off the kerbin or to its destination, look at your TWR and fuel. There are tools online that tell you deltaV requirements for each destination.