Jan and anyone who took this the wrong way
Didnt mean to offend sorry
what I should have said was
whilst many are happy with digital photos I want to use dads old slr for sentmental reasons.
Yes your right I am not experienced and with six months to go im sorting things out now.
He had
3 slrs 1 pentax p30t
1 praktica b20x
and a Voigtlander Vito B 1950's 35mm Camera
does that help?
You have an awesome collection there.
As for terms and numbers.
The mm is the focal length. In general, the bigger the number, the less you see, but the more zoom you get, and vice versa with the smaller number. As for the "f" stop, the number with is 3.5-5.6, that is the aperture. What this means, is that the smaller the number, the more light is coming into the camera, and vice versa. This is important, as this dictates what kind of film you will have to use. In sunlight, you can use anything between 50 (for bright sunshine) to 400 (for clouds). These numbers are known as ISO settings, and it just sets a rating for how sensitive your film is.
If I was you, I would take three cameras with me.
One with the 28mm, one with the 50mm, and one with a zoom.
Why? You are using film, and you cannot change films mid roll (well you can, but its a hassle). The best choice, is to use a fast film (something with a high ISO number) with a fast lens, (like the 50mm f/1.8), as this can give you great results in low light and even at night if used properly. Use the 28mm for general shots in daylight, as this gives you a nice wide view of everything around you. The film here isn't an issue, since its a fast enough lens for general daylight. If you see any clouds in the sky, I say go for ISO 200 or even 400 film.
As for the zoom lens, I recommend ISO 400 in daylight. This is a zoom, and it needs more light than a wide, since a lot of the light is lost by the time it reaches the film plane.
Hope that is clear. I recommend you learn how to use your equipment. Sleep with it if you have to (yes, some of use film lovers still do that), and get to know every kink in their bodies. It will give you good results.
Feel free to ask anything else you need.
Best of luck and have fun!