You can make a pretty good cut using a quick square(if you don't know google it) as a guide. Hold the square on the board to be cut and run the foot of the saw along the blade of the square. If you can't find a square you can make a guide that will do the same.
Jart had some good ideas for joinery but are they available to you and within your budget? Butt joints alone are pretty weak and screws are ok for holding things together while the glue dries. Good old mortise and tenon works well but are difficult, you could look at dowels, half-lap joints. Goolgle these things and look at some pictures and see what you can figure out? good luck!!
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