Is this combination ok?
 

Hello,
I'm asking if this combination will work :
- 5 speed freewheel
- Shimano RD-TY18 rear derailleur
- Shimano Tourney Shift Lever SL-TX30
or I need another freewheel?
Thx a lot for your answers.

Should work fine as long as the freewheel is Shimano index compatible.

Apparently that comes in 6 OR 7 speed? (I couldn't find a 5 speed on a quick search)
5 & 6 speed FW's have the same cog spacing at 5.5mm.
7 speed has a 5.0mm cog spacing.
So, use the 6 speed version if there isn't a 5 speed available
Set it up so you are using gears 1-5 and shifting to gear 6 just allows a bit of extra cable slack.

else, just get a 6 speed FW.
There may be other issues, depending on rear drop out spacing or ??

scroll down just a tiny bit.
https://www.sheldonbrown.com/cribsheet-spacing.html

Thanks for help.
I decided to use :
- Shimano Tourney MF-T500-6 freewheel
- Shimano RD-TY18 rear derailleur
- Shimano Tourney SL-TX30-6R shifter
and hope this combination will work fine. After resolving that I will ask you for help regarding the front derailleur.
PS1. The distance between dropouts is 135 mm.
PS2. Sorry for my english, I hope you understand what i want to say :)