So, you are new to the hobby aspect of miniature wargames and feel a bit overwelmed. Its understandable. I will post some tools you should look into as well as some general tips and tricks to make assembly smooth.
Most of these can be bought either at local hobby stores or hardware stores. these are my personal preferences,but you do you. Go to the local hobby shop or game store and talk to people they will give you really good advice on tools needed and what to buy and not buy.
Hobby Knife: - Use this to de-sprue your pieces and to remove mold lines by scrapping the back edge of the blade perpendicularly across the mold line (plenty of youtube tutorials)
https://www.amazon.com/X-ACTO-2-Knife-Safety-Cap/dp/B000V1QV7O/ref=sr_1_1?ie=UTF8&qid=1503492149&sr=8-1&keywords=exacto
Clippers: - quick and fast way to de-sprue bits to be cleaned further by a hobby knife
https://www.amazon.com/Revell-39000-Precision-Side-Cutter/dp/B00E9S1JHM/ref=sr_1_4?s=arts-crafts&ie=UTF8&qid=1503492462&sr=1-4&keywords=sprue+cutter
Files: - more model cleaning. This particular set has every shape and form needed for miniature wargaming
https://www.amazon.com/Precision-Needle-Jewelers-Metal-Glass/dp/B013WFLH3S/ref=sr_1_16?s=arts-crafts&ie=UTF8&qid=1503492508&sr=1-16&keywords=hobby+file+set
Plastic Glue: - I have been using this glue for 25years now (im only 31) this stuff is tried and true hands down the best plastic glue for Polystyrene (Typical model kits for boats, cars, planes) material
https://www.amazon.com/Testors-3507AT-Liquid-Plastic-1-Ounce/dp/B00005CA7S/ref=sr_1_8?ie=UTF8&qid=1503492559&sr=8-8&keywords=plastic+glue
Super Glue: - I used to swear by GaleForce9 but they have changed the bottles and the formula. This is the best super glue for me personally. It has a metal pin to make sure it never plugs.
https://www.amazon.com/Gorilla-Super-Glue-15-g/dp/B001IY82FM/ref=sr_1_6?ie=UTF8&qid=1503492551&sr=8-6&keywords=plastic+glue
Wall tac for posters and such. It is a great way to hold pieces together, or bases to pill bottles for better painting technique.
Tips:
Wash your sprues. Now I pretty much don't do this, so this is more of a do as I say not as I do. Take your sprues, rinse them and gentle wash them with dish soap and an old tooth brush. This helps get the mold release agent off the models which makes gluing and priming easier and stick better.
Dry fit your pieces. Make sure the pieces fit before you commit to glue. This is fairly important and can alleviate a lot of head aches or mistakes. You would be suprised how many people don't do this and put the wrong leg on the wrong side of the torso even though there are clearly marked instructions.
Follow directions. Really, its not hard, and one again saves lots of headaches.
Be patient.
Something I do not suggest is super glue accelerator. While it make set faster it leads to a more brittle bond which makes it easier for the model to accidentally break if you used super glue. If the set time is less than desired you can use sweat or spit. One thing I do (remember I don't wash my sprues so incoming tongue cancer) is put glue in the socket, lick the part that goes into the socket and combine. you can also run the piece across your forward in these warm summer months. I have no idea if certain sweat is better than others. Only down side is you will absolutely try to combine the pieces get frustrated lick or swipe and either have superglue on your tongue (which feels really really weird but comes off easy) or rip out part of your forehead. The joys of modelling.
Hope this helps and if anyone has any more suggestions for tips, pointers, tools feel free.