I think your stat distribution would depend on what your main weapon type will be.
-Guns tend to want perception, and strength for larger weapons like ARs or snipers (requirements can be found on wiki)
-Melee wants strength (for larger weapons ^^) or dex (damage scales of whichever is highest)
-If you want to use pistols (e.g. chemical pistol which might be nice for you) dex is important to lower the AP (action point cost) and to increase crit chance
-Seeing as you want to use chemistry and traps, I think it would be a good idea to invest heavily in Dex (~8 points to start) for 2 reasons.
1. Dex increases your trap skill (you will get a higher effective skill, meaning more bang for your buck when investing in traps).
2. Dex increases Your throwing skill, and high chemistry will let you make more powerful grenades. High dex also gives you access to nice feats to help with grenades.
-IF you go for chem pistol, you will need to invest in 7 INT for mad chemist and cooked shot feats as well.
-You can use Psionics without investing in WILL however it won't be as strong and will serve more as support.
-If going with the pistol you need to invest heavily in perception as this increases gun skill and will unluck many essential feats for you.
Having said all this, in a ramble, I would not suggest a build like this for new players as it will require a low CON (health) stat which can make the game harder if you don't know the fights well.
That being said, the last thing I want to do is tell you how to play the game and I encourage you to explore, make mistakes and learn.
An essential source of information is a massive FAQ by destroyor which goes over every aspect of the game in detail (spoilers are marked). :https://steamcommunity.com/sharedfiles/filedetails/?id=843557165
A lot of what I have said might be wrong or sub-optimal because I have just written this from the memory of these builds so If anyone sees anything wrong please correct me. Also if you OP want me to clarify anything or go into more detail let me know. I apologize for the rambly nature of this response.
P.S. Use the character builder
https://underrail.info/build/I realise I didn't mentioned stealth or traps, just max stealth and put as many points in traps as required (wiki can show you requirements for each trap)