You need to use verbs in the present forms followed by the word つもり to describe your future intention or plan.
<Example Sentences>
きょう マクドナルド に いく つもり です。
I am planning to go to MacDonald's today.
* いく is a verb in plain forms, which means "go". つもり follows a verb in plain forms, いく.
* You cannot use polite forms with つもり. Thus, きょう マクドナルド に いきます つもり です。is grammatically incorrect.
きょう としょかん で にほんご の べんきょう を する つもり です。
I am planning to study Japanese at the library today.
きょう は おさけ を のまない つもり です。
I am not planning to drink alcohol today.
*のまない is a negative plain form of のむ, which means "drink"
References:
Introduction to Plain Forms
https://anchor.fm/yuya-sato/episodes/Introduction-to-Plain-Forms-enp0g3
Actual Conversations Using Plain Forms
https://anchor.fm/yuya-sato/episodes/Actual-Conversations-Using-Plain-Forms-enqrpc
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