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A few thoughts:

1) GW tools are good solid quality tools that are overpriced. You can get the same quality for cheaper and some things really stand out - eg GW clippers are something like £20 a set, whereas a nice set of yellow handle clippers from any model shop would be probably a quarter of that price. So just be aware GW marks them up more so.

2) I can't say what you should or shouldn't have, each person finds what works for them and their style. I can say what are my most common tools and items that I reach for every time without hesitation that you might find of help:

a) Scalpel. I use an older GW one that had a nice chunky handle, but any good scalpel on the market would do. I like them for their sharp point, fine blade and ease of holding - a lot of larger knife blades are good general hobby tools, but I find their blades too thick and chunky for working into tiny parts of models when removing mould lines. A scalpel gets in nearly anywhere and is a great all round tool.

Swann and Morton make a lot of top grade scalpels and blades and are basically the market leader in the UK. Their non sterile blades are cheap to buy (you don't need sterile for model work).
A Swann Morton ACM No 2 Handle with No 2 blade would be a good starting point, though they've a range of blades and handle types to suit.

b) Clippers - a nice set of solid clippers with a small pair of blades to cut with. Great for removing bits from sprue.

c) A 900 Grit half round needle file. I love this thing! More durable and long lasting than sandpaper and emeryboards and gets into a lot of sight spaces. I've only found one place that stocks/makes these
https://www.eternaltools.com/files-burnishers/small-diamond-files
The half round gives you a curved space for corners and curved areas, a thin tip for fine areas and a flat side for smoother surfaces. Whilst a blade can clean up a lot, esp on plastic, this tool helps out a lot too. Being a diamond file it will cut in any direction of movement so you can work it into tight spots where you might only have one angle of motion to clean away a mould line.

d) A regular rubber. This is exclusively for the diamond files as plastic and pewter metals clog up files very quickly, esp fine ones. To clean a diamond file the only method I've found reference too is to use a rubber and simply use the file on the rubber to clean out the gunk. It works well too, makes a fair bit of mess, but it cleans the file out great.
You'll easily feel when a file is clogged as it will feel really smooth and won't cut so easily; it can also take on a more "polished shiny" look to its surface.

e) A cone headed black Clayshaper/colourshaper. This is for greenstuff work and a black cone head is my most used.
These tools let you smooth over any greenstuff area to give a smooth flush finish on the surface. They are fantastic and I'm surprised GW hasn't got their own line in their tool selection as I consider them almost essential for GS work. Even just for helping fill in little gaps. White are softest, then grey then black and a cone black is the one I used the most - though if you get into model work a set of 5 varied shapes in each colour isn't too much investment for long lasting tools (just keep them away from any types of glue).

f) Greenstuff. Marines are a pretty solid plastic kit and many plastic kits don't need any work, but if you do get a gap or need some work greenstuff is there to help. Ebay has loads of store selling rolls of it for far less than GW's markup.

g) Standard greenstuff tool - GW has this on show and its the one with a blade one end and a small smoothing surface at the other. Although if you look on ebay a "set of clay tools" can give you that tool plus a load of others for not much cost.
Whilst the clay shaper mentioned earlier is a solid finishing tool, metal tools are good for crafting and moving greenstuff around and getting it into slots/gaps/holes etc...

You can probably leave off the greenstuff and associated tools for the tac marines, but keep it in mind as you get more into model work.

h) Pinvice - tac marines shouldn't need any pinning so chances are you might not need this as yet. Like the greenstuff tools though its a solid investment for any hobbyist. Either for letting you drill into models to put pins in to strengthen joints and bonding areas; or drilling out slots for magnets or conversion work. A good solid all round tool well worth in the bag, but, liks I said, might not be much use for just a box of marines unless you're going down a magnetic path.