Hi there trudie, lets discuss your list:
condensation tray: Interesting, I'm not entirely sure what this is but I'm going to assume you mean a lid for the tank that sits between the tank top and the lighting system. If so, then yes that's a great piece of equipment and very important for several reasons. First of all, the more complete you can make it, the better it keeps in jumping fish. Believe it or not fish jumping out happens a lot. Shouldn't be so tight that you worry about fresh air getting in there or that you can't find a nice hole for pouring in various capfuls of liquids without having to lift the front lid, but still it should be fairly comprehensive in its coverage I'd say. Secondly, it protects your lighting system from premature failure from excess moisture. There's going to be a lot of moisture that gets in an aquarium light system in any case but this helps slow it down. And finally of course it slows the evaporation, although that doesn't matter so much because one should always have the good habit of water changes going on which takes care of this.
Liquid master test kit - what make?: As above, I and many others on here are very happy with the API Freshwater Master Test Kit. The Nutrafin Mini-Master is also good, may even test some things better, but I've also heard complaints about being able to interpret the pink levels.. but not really any more than the complaints about being able to interpret the colors on the API tests. It really just takes beginners a while to get the feel of how to guess at the number to fix on for a given color result and its usually not quite as critical as the beginner thinks at the time. I've also read a few posts where users seemed to be getting bad results from Interpet ones, but any kit can have "duff" results either from the liquid being too old or bad user technique, etc. The most important thing is to own a liquid-reagent based kit in the first place and to use it frequently as a beginner to help you understand things in a quantitative manner.
thermometer: These are very important as you can't ever trust the settings on a heater control. The heater control should always be adjusted based on your own feedback from looking at your thermometer. Better I think to go for plain old liquid in glass cheap ones inside float tubes and just get maybe more than one for backup and comparison. Suction cups can stick them whereever you want.
New filters: Well this is a huge topic, so we should be aware we won't cover it all. You should do some searches and attempt to learn the basics (I can do them in some other post maybe.) A good starting point is the 5x Turnover guideline for flow rate. Take your tank volume, multiply it by 5 and write down both the big number in both US gallons and liters. That big number is the number of gallons or liters per hour (!) that you want your water to turn over in the system. It can take some digging at manufacturers web sites to figure out the flow rate of a given model of filter to see how it fits your picture. Now in the ideal world (eg. if you've got plenty of money!) one would like to then divide this filter power in two and have two filters so that one can clean only one at a time and so that there is backup if one fails. This is awfully fancy though and most of us beginners, me included, have only one filter on our tank. I use an external cannister, which I think of as an awesome type of filter that I wish I had had years ago as it does the best job possible I think. But a good experienced aquarist can make any type of filtration do a good job and there are things to like about all the types, like HOB (Hang on Back) and internal (box down in the tank.) You'll need to learn about the differences between mechanical, chemical and biological filtration which is how we divide up the functional purposes of aquarium filtration. (Don't freeek, its a chicken-n-egg problem, deciding on filtratration and getting started!)
ammonia: Getting the right ammonia for your fishless cycle can be the hardest thing there is (before you've found it) and the easiest thing in the world (after you've got it!) What we use is pure, clear, household ammonia that gets sold sometimes for people who want to skip the commercialism and buy cheap housecleaning materials. As such we hope to find it in grocery stores (in the US this is common) or in hardware stores or bigbox everything stores. In the UK, lots of members can help. Its ideal when you can see in the bottle. When you shake it you want it to bubble like water would, not to foam up. That's because you don't want any soaps or fragrances or dyes in the ammonia. Often they come in quart or half gallon bottles which is fine.
OK, let us know how its going!
~~waterdrop~~